drm/vc4: 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/20191121132919.29430-1-krzk@kernel.org

drivers/gpu/drm/vc4/Kconfig

@@ -22,9 +22,9 @@ config DRM_VC4
 	  our display setup.
 
 config DRM_VC4_HDMI_CEC
-       bool "Broadcom VC4 HDMI CEC Support"
-       depends on DRM_VC4
-       select CEC_CORE
-       help
+	bool "Broadcom VC4 HDMI CEC Support"
+	depends on DRM_VC4
+	select CEC_CORE
+	help
 	  Choose this option if you have a Broadcom VC4 GPU
 	  and want to use CEC.