rockchip: rk3328: Migrate to OF_UPSTREAM

All RK3328 boards has now been synced to Linux kernel v6.8 DTs and can
migrate to use OF_UPSTREAM.

Migrate all RK3328 boards to use OF_UPSTREAM.

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 f1caf4f..a492b08 100644
--- a/arch/arm/mach-rockchip/Kconfig
+++ b/arch/arm/mach-rockchip/Kconfig
@@ -197,6 +197,7 @@
 	imply MISC
 	imply MISC_INIT_R
 	imply OF_LIVE
+	imply OF_UPSTREAM
 	imply PRE_CONSOLE_BUFFER
 	imply ROCKCHIP_COMMON_BOARD
 	imply ROCKCHIP_EFUSE