drm/armada: make variant a CRTC thing

Move the variant pointer into the armada_crtc structure, and update for
the resulting changes.

Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>

diff --cc drivers/gpu/drm/armada/armada_510.c
Simple merge

diff --cc drivers/gpu/drm/armada/armada_crtc.c
Simple merge

diff --cc drivers/gpu/drm/armada/armada_crtc.h
Simple merge

diff --cc drivers/gpu/drm/armada/armada_drm.h
Simple merge

diff --cc drivers/gpu/drm/armada/armada_drv.c
Simple merge