arm64: dts: rockchip: Add rk3588 based Radxa CM5

arm64: dts: rockchip: Add rk3588 based Radxa CM5

Add initial support for the Radxa Compute Module 5 (CM5). The CM5 uses a
proprietary connector.

Specification:
- Rockchip RK3588
- Up to 32 GB LPDDR4X
- Up to 128 GB eMMC
- 1x HDMI TX up to 8k@60 hz
- 1x eDP TX up to 4k@60 hz
- Gigabit Ethernet PHY

Signed-off-by: Joseph Kogut <joseph.kogut@gmail.com>
Signed-off-by: FUKAUMI Naoki <naoki@radxa.com>
Link: https://patch.msgid.link/20251205120703.14721-3-naoki@radxa.com
Signed-off-by: Heiko Stuebner <heiko@sntech.de>