video: Add new aspect ratios for HDMI 2.0

HDMI 2.0/CEA-861-F introduces two new aspect ratios:
- 64:27
- 256:135

This patch adds enumeration for the new aspect ratios
in the existing aspect ratio list.

V2: rebase
V3: rebase
V4: Added r-b from Jose, Ack by Tomi

Signed-off-by: Shashank Sharma <shashank.sharma@intel.com>
Reviewed-by: Sean Paul <seanpaul@chromium.org>
Reviewed-by: Jose Abreu <Jose.Abreu@synopsys.com>
Acked-by: Tomi Valkeinen <tomi.valkeinen@ti.com>
Cc: Daniel Vetter <daniel.vetter@ffwll.ch>
Cc: Emil Velikov <emil.l.velikov@gmail.com>
Signed-off-by: Daniel Vetter <daniel.vetter@ffwll.ch>
Link: http://patchwork.freedesktop.org/patch/msgid/1476705880-15600-4-git-send-email-shashank.sharma@intel.com

drivers/video/hdmi.c

@@ -533,6 +533,10 @@ hdmi_picture_aspect_get_name(enum hdmi_picture_aspect picture_aspect)
 		return "4:3";
 	case HDMI_PICTURE_ASPECT_16_9:
 		return "16:9";
+	case HDMI_PICTURE_ASPECT_64_27:
+		return "64:27";
+	case HDMI_PICTURE_ASPECT_256_135:
+		return "256:135";
 	case HDMI_PICTURE_ASPECT_RESERVED:
 		return "Reserved";
 	}

include/linux/hdmi.h

@@ -78,6 +78,8 @@ enum hdmi_picture_aspect {
 	HDMI_PICTURE_ASPECT_NONE,
 	HDMI_PICTURE_ASPECT_4_3,
 	HDMI_PICTURE_ASPECT_16_9,
+	HDMI_PICTURE_ASPECT_64_27,
+	HDMI_PICTURE_ASPECT_256_135,
 	HDMI_PICTURE_ASPECT_RESERVED,
 };