arm64: defconfig: enable rockchip graphics

Enable the graphics-related options needed by Rockchip boards.
This includes the pwm-backlight which will be needed by the internal
displays used on Gru Chrome-devices.
Signed-off-by: Heiko Stuebner <heiko@sntech.de>
Reviewed-by: Mark yao <mark.yao@rock-chips.com>
Signed-off-by: Olof Johansson <olof@lixom.net>

arch/arm64/configs/defconfig

@@ -372,6 +372,12 @@ CONFIG_DRM_EXYNOS_DSI=y
 # CONFIG_DRM_EXYNOS_DP is not set
 CONFIG_DRM_EXYNOS_HDMI=y
 CONFIG_DRM_EXYNOS_MIC=y
+CONFIG_DRM_ROCKCHIP=m
+CONFIG_ROCKCHIP_ANALOGIX_DP=y
+CONFIG_ROCKCHIP_CDN_DP=y
+CONFIG_ROCKCHIP_DW_HDMI=y
+CONFIG_ROCKCHIP_DW_MIPI_DSI=y
+CONFIG_ROCKCHIP_INNO_HDMI=y
 CONFIG_DRM_RCAR_DU=m
 CONFIG_DRM_RCAR_LVDS=y
 CONFIG_DRM_RCAR_VSP=y
@@ -384,6 +390,7 @@ CONFIG_DRM_MESON=m
 CONFIG_FB=y
 CONFIG_FB_ARMCLCD=y
 CONFIG_BACKLIGHT_GENERIC=m
+CONFIG_BACKLIGHT_PWM=m
 CONFIG_BACKLIGHT_LP855X=m
 CONFIG_FRAMEBUFFER_CONSOLE=y
 CONFIG_LOGO=y
@@ -499,6 +506,7 @@ CONFIG_ARM_MHU=y
 CONFIG_PLATFORM_MHU=y
 CONFIG_BCM2835_MBOX=y
 CONFIG_HI6220_MBOX=y
+CONFIG_ROCKCHIP_IOMMU=y
 CONFIG_ARM_SMMU=y
 CONFIG_ARM_SMMU_V3=y
 CONFIG_RPMSG_QCOM_SMD=y