drm/edid: Add 6 bpc quirk for BOE panel.

drm/edid: Add 6 bpc quirk for BOE panel.

BOE panel (ID: 0x0771) that reports "DFP 1.x compliant TMDS".
But it's 6bpc panel only instead of 8 bpc.

Add panel ID to edid quirk list and set 6 bpc as default to
work around this issue.

Cc: Jani Nikula <jani.nikula@intel.com>
Cc: Maarten Lankhorst <maarten.lankhorst@linux.intel.com>
Cc: Gustavo Padovan <gustavo@padovan.org>
Cc: Cooper Chiou <cooper.chiou@intel.com>
Signed-off-by: Lee, Shawn C <shawn.c.lee@intel.com>>
Signed-off-by: Daniel Vetter <daniel.vetter@ffwll.ch>
Link: https://patchwork.freedesktop.org/patch/msgid/1540792173-7288-1-git-send-email-shawn.c.lee@intel.com