drm/edid: add support for parsing quantization select field

Add support for parsing the RGB and YCC quantization
selectable field from the Video Capability Data block(VCDB)
of the EDID.

These fields help to decide whether the default quantization
range for a particular video format can be overridden by the
source.

Change-Id: Ibc72eb13302527089ad66231cd7e8bb34fb364f3
Signed-off-by: Abhinav Kumar <abhinavk@codeaurora.org>