rockchip: px30/rk3326: migrate to OF_UPSTREAM

Migrate PX30/RK3326 boards that exists in Linux v6.8 to use OF_UPSTREAM.

firefly-px30 is not migrated to OF_UPSTREAM because there's no Device
Tree in the Linux kernel.

Differences between U-Boot's Odroid-Go2 and Linux's are now moved to the
-u-boot.dtsi, though I have a gut feeling that the existing cru
overrides aren't necessary (anymore?).

The U-Boot GPIO led-0 is on GPIO0_C1 but such is the pin of PWM3 which
is used for Linux's PWM led-2 so keep Linux's.

I also doubt vcc_cam is actually used, though the Odroid-Go2 Black
Edition uses this dcdc regulator for WiFi, so let's just move it to the
-u-boot.dtsi to play it safe.

Signed-off-by: Quentin Schulz <quentin.schulz@cherry.de>
diff --git a/configs/odroid-go2_defconfig b/configs/odroid-go2_defconfig
index f4c9b02..a9af415 100644
--- a/configs/odroid-go2_defconfig
+++ b/configs/odroid-go2_defconfig
@@ -5,7 +5,7 @@
 CONFIG_NR_DRAM_BANKS=1
 CONFIG_ENV_SIZE=0x4000
 CONFIG_ENV_OFFSET=0x4000
-CONFIG_DEFAULT_DEVICE_TREE="rk3326-odroid-go2"
+CONFIG_DEFAULT_DEVICE_TREE="rockchip/rk3326-odroid-go2"
 CONFIG_DM_RESET=y
 CONFIG_ROCKCHIP_PX30=y
 # CONFIG_TPL_ROCKCHIP_COMMON_BOARD is not set