drm/atmel-hlcdc: Constify function pointer structs

drm/atmel-hlcdc: Constify function pointer structs

Moves a bunch of junk to .rodata from .data.

drivers/gpu/drm/atmel-hlcdc/atmel-hlcdc-dc.ko:
-.text                       12488
+.text                       12480
-.rodata                      1696
+.rodata                      1760
-.data                         776
+.data                         712

Signed-off-by: Ville Syrjälä <ville.syrjala@linux.intel.com>
Reviewed-by: Alex Deucher <alexander.deucher@amd.com>
Acked-by: Boris Brezillon <boris.brezillon@free-electrons.com>
Signed-off-by: Thierry Reding <treding@nvidia.com>
Signed-off-by: Boris Brezillon <boris.brezillon@free-electrons.com>
Link: http://patchwork.freedesktop.org/patch/msgid/1450178476-26284-13-git-send-email-boris.brezillon@free-electrons.com
Signed-off-by: Daniel Vetter <daniel.vetter@ffwll.ch>