realtek: rtl930x: add support for Hasivo F1100W-4SX-4XGT and variants

realtek: rtl930x: add support for Hasivo F1100W-4SX-4XGT and variants

This commit adds support for the Hasivo F1100W-4SX-4XGT ethernet 10Gbase and PoE switch.
It also adds support for a whole matrix of variants of this device:

| Device              | Revision | RAM    | PoE | Console  |
|---------------------|----------|--------|-----|----------|
| F1100W-4SX-4XGT     | v1.03    | 256 MB | n/a | RJ45     |
| F1100W-4SX-4XGT     | v1.02    | 512 MB | n/a | RJ45     |
| F1100W-4SX-4XGT-SE  | v1.03    | 256 MB | n/a | internal |
| F1100W-4SX-4XGT-SE  | v1.02    | 512 MB | n/a | internal |
| F1100WP-4SX-4XGT    | v1.03    | 256 MB | yes | RJ45     |
| F1100WP-4SX-4XGT    | v1.02    | 512 MB | yes | RJ45     |
| F1100WP-4SX-4XGT-SE | v1.03    | 256 MB | yes | internal |
| F1100WP-4SX-4XGT-SE | v1.02    | 512 MB | yes | internal |

The devices are identical except for presence of the PoE daughter board,
RJ45 console port, and 256 or 512 MB RAM.

The non-512 MB image also works on the older 512 MB board revisions, but not vice versa.

Credit to @mensi @bevanweiss @markc1984

Hardware
--------

|          |                                                           |
|----------|-----------------------------------------------------------|
| SoC      | RTL9303 rev B                                             |
| RAM      | 256 MB Samsung K4B2G1646F DDR3L (board revision v1.03),   |
|          | or 512 MB unknown module (board revision v1.02 and older) |
| Flash    | 32 MB Macronix MX25L25645G SPI NOR,                       |
|          | 29 MiB usable by OpenWrt                                  |
| Ethernet | 4x SFP+ via SoC (10G/2.5G/1G),                            |
|          | 4x RJ45 via 4x RTL8261BE PHY (10G/5G/2.5G/1G/100M/10M)    |
| PoE      | only on WP variants                                       |
|          | 1x 802.3bt 90 W (port 5)                                  |
|          | 3x 802.3at 30 W (ports 6, 7, 8)                           |
|          | via daughter board with Hasivo HS104PTI controller        |
|          | PoE works but is unmanaged --> future work                |
| LEDs     | 1x system orange/green, 8x link green/red, 4x PoE orange  |
| Button   | Reset                                                     |
| Console  | RJ45 38400 bps 8n1, or pin holes on SE variants           |

Installing OpenWrt
------------------

Note: With vendor firmware 7.1.9, the bootloader's network profile is broken.
We need to select a different profile with port/phy overlap to make the TFTP
transfer work. Then only port 5 works in the OpenWrt initramfs, but all ports
work fine after flashing, when we don't need the profile trick anymore.

1. Attach to RJ45 serial console port using a cisco cable.
2. Attach your computer to Port 5 (the first RJ45 port).
3. Serve initramfs-kernel.bin on TFTP 192.168.1.111.
4. Power on the device.
5. Interrupt U-Boot by pressing `Ctrl+C`, then `Z`, then `H`, during 3 second countdown.
6. Run: `setenv boardmodel 'RTL9303_5x8261BE_2XGE_ZHIHUI' ; rtk network on`
7. Run: `tftpboot 0x84f00000 initramfs-kernel.bin ; bootm 0x84f00000`
8. Use `mtd dump` to make backups of all flash partitions.
9. Use SCP to copy `squashfs-sysupgrade.bin` to the device, then run `sysupgrade`.

Restoring factory firmware
--------------------------

OpenWrt uses the `RUNTIME` and `RUNTIME2` partitions as one combined partition.
To restore them from backups, boot from `initramfs-kernel.bin` just like during
the installation, then use `mtd write` to write your backups of the factory
`mtd5` and `mtd6` partitions.

Notes/Quirks
------------

- U-Boot interruption is obfuscated. Press `Ctrl+C`, then `Z`, then `H`,
  during the 3 second countdown.
- U-Boot rtk network profile is broken. Use the `RTL9303_5x8261BE_2XGE_ZHIHUI` profile
  instead, it makes at least port 5 work.
- MAC address is stored on the `RUNTIME` or `RUNTIME2` partitions, which are used by OpenWrt.
  Instead, we generate one random MAC address and store it in the U-Boot environment.
- PoE works but is unmanaged. The HS104 driver is worked on in
  https://github.com/openwrt/openwrt/pull/22245 and will work with ethtool and the
  kernel's new `pse-pd` subsystem.

Signed-off-by: Lars Gierth <larsg@systemli.org>
Link: https://github.com/openwrt/openwrt/pull/23020
Signed-off-by: Jonas Jelonek <jelonek.jonas@gmail.com>