qualcommax: ipq60xx: add JDCloud RE-SS-01 support

qualcommax: ipq60xx: add JDCloud RE-SS-01 support

Specifications:
  SoC:     Qualcomm IPQ6000 1.2GHz
  RAM:     NT52CB256MB16DP 512MiB
  Flash:   FORESEE 64GB/128GB eMMC
  ETH:     QCA8075 (3x LAN, 1x WAN)
  WLAN1:   QCN5022 2.4GHz AX 2x2
  WLAN2:   QCN5052 5GHz AX 2x2
  Power:   DC 12V 2A
  Button:  Reset, Wps
  USB:     1x 3.0

Flash instructions:
  1. Download the initramfs image, rename it to
     initramfs.itb, host it with the tftp server.
  2. If the stock firmware version is 4.3.0.r4211
     or higher, enter "jdmt018R" to interrupt
     U-Boot when the following statement appears:
     "disabled console and autoboot in 2 seconds"
  3. Run these commands in U-Boot console:
     tftpboot initramfs.itb
     bootm
  4. After openwrt boots up, use scp or luci web
     to upload sysupgrade.bin to upgrade.

Signed-off-by: Chukun Pan <amadeus@jmu.edu.cn>
Link: https://github.com/openwrt/openwrt/pull/19780
Signed-off-by: Robert Marko <robimarko@gmail.com>