arm64: defconfig: Enable Rockchip extensions for Synopsys DW DP

Enable Rockchip specific extensions for Synopsys DesignWare DisplayPort
driver. This is used to provide DisplayPort output support for many boards
based on RK3588 SoC.

Signed-off-by: Andy Yan <andyshrk@163.com>
Signed-off-by: Heiko Stuebner <heiko@sntech.de>

Author: andyshrk

arch/arm64/configs/defconfig

@@ -913,6 +913,7 @@ CONFIG_DRM_ROCKCHIP=m
 CONFIG_ROCKCHIP_VOP2=y
 CONFIG_ROCKCHIP_ANALOGIX_DP=y
 CONFIG_ROCKCHIP_CDN_DP=y
+CONFIG_ROCKCHIP_DW_DP=y
 CONFIG_ROCKCHIP_DW_HDMI=y
 CONFIG_ROCKCHIP_DW_HDMI_QP=y
 CONFIG_ROCKCHIP_DW_MIPI_DSI=y