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>
diff --git a/arch/arm/mach-rockchip/Kconfig b/arch/arm/mach-rockchip/Kconfig
index 03f6bf4..0b90984 100644
--- a/arch/arm/mach-rockchip/Kconfig
+++ b/arch/arm/mach-rockchip/Kconfig
@@ -355,6 +355,7 @@
 	imply MISC_INIT_R
 	imply MMC_HS200_SUPPORT if MMC_SDHCI_ROCKCHIP
 	imply OF_LIBFDT_OVERLAY
+	imply OF_UPSTREAM
 	imply PHY_GIGE if DWC_ETH_QOS_ROCKCHIP
 	imply RNG_ROCKCHIP
 	imply ROCKCHIP_COMMON_BOARD