drm/rockchip: Fix Kconfig indentation

Adjust indentation from spaces to tab (+optional two spaces) as in
coding style with command like:
	$ sed -e 's/^        /\t/' -i */Kconfig
Signed-off-by: Krzysztof Kozlowski <krzk@kernel.org>
Signed-off-by: Daniel Vetter <daniel.vetter@ffwll.ch>
Link: https://patchwork.freedesktop.org/patch/msgid/20191120133348.6640-1-krzk@kernel.org

drivers/gpu/drm/rockchip/Kconfig

@@ -28,17 +28,17 @@ config ROCKCHIP_ANALOGIX_DP
 	  on RK3288 or RK3399 based SoC, you should select this option.
 
 config ROCKCHIP_CDN_DP
-        bool "Rockchip cdn DP"
+	bool "Rockchip cdn DP"
 	depends on EXTCON=y || (EXTCON=m && DRM_ROCKCHIP=m)
-        help
+	help
 	  This selects support for Rockchip SoC specific extensions
 	  for the cdn DP driver. If you want to enable Dp on
 	  RK3399 based SoC, you should select this
 	  option.
 
 config ROCKCHIP_DW_HDMI
-        bool "Rockchip specific extensions for Synopsys DW HDMI"
-        help
+	bool "Rockchip specific extensions for Synopsys DW HDMI"
+	help
 	  This selects support for Rockchip SoC specific extensions
 	  for the Synopsys DesignWare HDMI driver. If you want to
 	  enable HDMI on RK3288 or RK3399 based SoC, you should select