drm/msm: add support for parsing YUV 420 deep color

Current upstream parser only handles RGB deep color
modes.

Add support in the SDE EDID parser module to parse
HDMI VSDB block and indicate support for YUV 420
deep color modes in the sink.

Change-Id: If6c007263094e7716a29cae503d3e3471ae04306
Signed-off-by: Abhinav Kumar <abhinavk@codeaurora.org>
diff --git a/include/drm/drm_edid.h b/include/drm/drm_edid.h
index 32bd104..1bcf8f7 100644
--- a/include/drm/drm_edid.h
+++ b/include/drm/drm_edid.h
@@ -212,6 +212,11 @@
 #define DRM_EDID_HDMI_DC_30               (1 << 4)
 #define DRM_EDID_HDMI_DC_Y444             (1 << 3)
 
+/* YCBCR 420 deep color modes */
+#define DRM_EDID_YCBCR420_DC_48  (1 << 2)
+#define DRM_EDID_YCBCR420_DC_36  (1 << 1)
+#define DRM_EDID_YCBCR420_DC_30  (1 << 0)
+
 /* ELD Header Block */
 #define DRM_ELD_HEADER_BLOCK_SIZE	4