rockchip: rk3588: Migrate to OF_UPSTREAM

Migrate RK3588 boards that exists in Linux v6.8 to use OF_UPSTREAM.

Following targets is not migrated to use OF_UPSTREAM:
- generic-rk3588: Generic target only meant for U-Boot use
- toybrick-rk3588: Merged in v6.9-rc1

Signed-off-by: Jonas Karlman <jonas@kwiboo.se>
Reviewed-by: Kever Yang <kever.yang@rock-chips.com>