drm/rcar-du: Split features and quirks

128-byte pitch alignement is not a hardware feature, it's a hardware
bug. Split it from the features field into a new quirks field. New
quirks will be added to support the R8A7791 SoC.

Signed-off-by: Laurent Pinchart <laurent.pinchart+renesas@ideasonboard.com>

diff --cc drivers/gpu/drm/rcar-du/rcar_du_drv.c
Simple merge

diff --cc drivers/gpu/drm/rcar-du/rcar_du_drv.h
Simple merge

diff --cc drivers/gpu/drm/rcar-du/rcar_du_kms.c
Simple merge