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/configs/roc-pc-mezzanine-rk3399_defconfig b/configs/roc-pc-mezzanine-rk3399_defconfig
index 8141f80..a57899b 100644
--- a/configs/roc-pc-mezzanine-rk3399_defconfig
+++ b/configs/roc-pc-mezzanine-rk3399_defconfig
@@ -8,7 +8,7 @@
 CONFIG_ENV_SIZE=0x8000
 CONFIG_ENV_OFFSET=0x3F8000
 CONFIG_ENV_SECT_SIZE=0x1000
-CONFIG_DEFAULT_DEVICE_TREE="rk3399-roc-pc-mezzanine"
+CONFIG_DEFAULT_DEVICE_TREE="rockchip/rk3399-roc-pc-mezzanine"
 CONFIG_DM_RESET=y
 CONFIG_ROCKCHIP_RK3399=y
 CONFIG_ROCKCHIP_SPI_IMAGE=y