rockchip: rk3399: Migrate to OF_UPSTREAM

All RK3399 boards has now been synced to Linux kernel v6.8 DTs and can
migrate to use OF_UPSTREAM.

Migrate RK3399 boards that exists in Linux v6.8 to use OF_UPSTREAM.

Following target is not migrated to use OF_UPSTREAM:
- nanopi-m4-2gb-rk3399: DDR3 variant of nanopi-m4-rk3399 (LPDDR3)

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