drm/armada: add drm_mode_set_crtcinfo() mode fixup

Add a drm_mode_set_crtcinfo() call in our CRTC's mode_fixup callback
to ensure that any adjustments to the mode made by connectors etc are
properly accounted for by the CRTC.

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