video: Check EDID for HDMI connection

Check EDID Vendor Specific Data Block bytes to see if the connection
is HDMI and set FB_MISC_HDMI.

Signed-off-by: David Ung <davidu@nvidia.com>
Signed-off-by: Christopher Freeman <cfreeman@nvidia.com>
Signed-off-by: Tomi Valkeinen <tomi.valkeinen@ti.com>