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>
diff --git a/arch/arm/dts/Makefile b/arch/arm/dts/Makefile
index b7ada58..7a65d98 100644
--- a/arch/arm/dts/Makefile
+++ b/arch/arm/dts/Makefile
@@ -98,37 +98,6 @@
 	rk3368-geekbox.dtb \
 	rk3368-px5-evb.dtb \
 
-dtb-$(CONFIG_ROCKCHIP_RK3399) += \
-	rk3399-evb.dtb \
-	rk3399-eaidk-610.dtb \
-	rk3399-ficus.dtb \
-	rk3399-firefly.dtb \
-	rk3399-gru-bob.dtb \
-	rk3399-gru-kevin.dtb \
-	rk3399-khadas-edge.dtb \
-	rk3399-khadas-edge-captain.dtb \
-	rk3399-khadas-edge-v.dtb \
-	rk3399-leez-p710.dtb \
-	rk3399-nanopc-t4.dtb \
-	rk3399-nanopi-m4.dtb \
-	rk3399-nanopi-m4-2gb.dtb \
-	rk3399-nanopi-m4b.dtb \
-	rk3399-nanopi-neo4.dtb \
-	rk3399-nanopi-r4s.dtb \
-	rk3399-orangepi.dtb \
-	rk3399-pinebook-pro.dtb \
-	rk3399-pinephone-pro.dtb \
-	rk3399-puma-haikou.dtb \
-	rk3399-roc-pc.dtb \
-	rk3399-roc-pc-mezzanine.dtb \
-	rk3399-rock-4c-plus.dtb \
-	rk3399-rock-4se.dtb \
-	rk3399-rock-pi-4a.dtb \
-	rk3399-rock-pi-4c.dtb \
-	rk3399-rock960.dtb \
-	rk3399-rockpro64.dtb \
-	rk3399pro-rock-pi-n10.dtb
-
 dtb-$(CONFIG_ROCKCHIP_RK3568) += \
 	rk3566-anbernic-rgxx3.dtb \
 	rk3566-pinetab2-v0.1.dtb \
diff --git a/arch/arm/mach-rockchip/Kconfig b/arch/arm/mach-rockchip/Kconfig
index a492b08..a2c8148 100644
--- a/arch/arm/mach-rockchip/Kconfig
+++ b/arch/arm/mach-rockchip/Kconfig
@@ -272,6 +272,7 @@
 	imply MISC_INIT_R
 	imply OF_LIBFDT_OVERLAY
 	imply OF_LIVE
+	imply OF_UPSTREAM
 	imply PARTITION_TYPE_GUID
 	imply PHY_GIGE if GMAC_ROCKCHIP
 	imply PRE_CONSOLE_BUFFER