rockchip: rk3399: Enable DT overlay support on all boards

Imply OF_LIBFDT_OVERLAY Kconfig options to add device tree overlay
support on all RK3399 boards.

Signed-off-by: Jonas Karlman <jonas@kwiboo.se>
Reviewed-by: Quentin Schulz <quentin.schulz@theobroma-systems.com>
Reviewed-by: Kever Yang <kever.yang@rock-chips.com>
Reviewed-by: Dragan Simic <dsimic@manjaro.org>
diff --git a/arch/arm/mach-rockchip/Kconfig b/arch/arm/mach-rockchip/Kconfig
index 6f1213b..bfde9bf 100644
--- a/arch/arm/mach-rockchip/Kconfig
+++ b/arch/arm/mach-rockchip/Kconfig
@@ -269,6 +269,7 @@
 	imply LEGACY_IMAGE_FORMAT
 	imply MISC
 	imply MISC_INIT_R
+	imply OF_LIBFDT_OVERLAY
 	imply OF_LIVE
 	imply PARTITION_TYPE_GUID
 	imply PHY_GIGE if GMAC_ROCKCHIP
diff --git a/configs/rock-4c-plus-rk3399_defconfig b/configs/rock-4c-plus-rk3399_defconfig
index bebea4f..6c69e8b 100644
--- a/configs/rock-4c-plus-rk3399_defconfig
+++ b/configs/rock-4c-plus-rk3399_defconfig
@@ -5,7 +5,6 @@
 CONFIG_NR_DRAM_BANKS=1
 CONFIG_ENV_OFFSET=0x3F8000
 CONFIG_DEFAULT_DEVICE_TREE="rk3399-rock-4c-plus"
-CONFIG_OF_LIBFDT_OVERLAY=y
 CONFIG_DM_RESET=y
 CONFIG_ROCKCHIP_RK3399=y
 CONFIG_TARGET_ROCKPI4_RK3399=y
diff --git a/configs/rock-4se-rk3399_defconfig b/configs/rock-4se-rk3399_defconfig
index 04622df..e5ed810 100644
--- a/configs/rock-4se-rk3399_defconfig
+++ b/configs/rock-4se-rk3399_defconfig
@@ -5,7 +5,6 @@
 CONFIG_NR_DRAM_BANKS=1
 CONFIG_ENV_OFFSET=0x3F8000
 CONFIG_DEFAULT_DEVICE_TREE="rk3399-rock-4se"
-CONFIG_OF_LIBFDT_OVERLAY=y
 CONFIG_DM_RESET=y
 CONFIG_ROCKCHIP_RK3399=y
 CONFIG_TARGET_ROCKPI4_RK3399=y
diff --git a/configs/rock-pi-4-rk3399_defconfig b/configs/rock-pi-4-rk3399_defconfig
index 9036c51..2801bec 100644
--- a/configs/rock-pi-4-rk3399_defconfig
+++ b/configs/rock-pi-4-rk3399_defconfig
@@ -6,7 +6,6 @@
 CONFIG_SF_DEFAULT_SPEED=10000000
 CONFIG_ENV_OFFSET=0x3F8000
 CONFIG_DEFAULT_DEVICE_TREE="rk3399-rock-pi-4a"
-CONFIG_OF_LIBFDT_OVERLAY=y
 CONFIG_DM_RESET=y
 CONFIG_ROCKCHIP_RK3399=y
 CONFIG_ROCKCHIP_SPI_IMAGE=y
diff --git a/configs/rock-pi-4c-rk3399_defconfig b/configs/rock-pi-4c-rk3399_defconfig
index e1adec6..72d37bf 100644
--- a/configs/rock-pi-4c-rk3399_defconfig
+++ b/configs/rock-pi-4c-rk3399_defconfig
@@ -5,7 +5,6 @@
 CONFIG_NR_DRAM_BANKS=1
 CONFIG_ENV_OFFSET=0x3F8000
 CONFIG_DEFAULT_DEVICE_TREE="rk3399-rock-pi-4c"
-CONFIG_OF_LIBFDT_OVERLAY=y
 CONFIG_DM_RESET=y
 CONFIG_ROCKCHIP_RK3399=y
 CONFIG_TARGET_ROCKPI4_RK3399=y