arm64: dts: rockchip: add Forlinx FET3588-C

FET3588-C is an System on Module made by Forlinx based on Rockchip RK3588.
This SoM used by OK3588-C Board.

FET3588-C features:
- Rockchip RK3588
- LPDDR4 4/8 GB
- eMMC 32/64 GB

Add support for Forlinx FET3588-C SoM.
Signed-off-by: Dmitry Yashin <dmt.yashin@gmail.com>
Link: https://lore.kernel.org/r/20240403151229.30577-3-dmt.yashin@gmail.comSigned-off-by: Heiko Stuebner <heiko@sntech.de>