UPSTREAM: drm/bridge/dw_hdmi: Constify function pointer structs

UPSTREAM: drm/bridge/dw_hdmi: Constify function pointer structs

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

 drivers/gpu/drm/bridge/dw_hdmi.ko:
-.rodata                      120
+.rodata                      216
-.data                         96
+.data                          0

Signed-off-by: Ville Syrjälä <ville.syrjala@linux.intel.com>
Reviewed-by: Alex Deucher <alexander.deucher@amd.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/1450178476-26284-15-git-send-email-boris.brezillon@free-electrons.com
Signed-off-by: Daniel Vetter <daniel.vetter@ffwll.ch>
Change-Id: Ib35041ba0962794da3ff80110c6e429dacaf9178
Signed-off-by: Yakir Yang <ykk@rock-chips.com>
(cherry pick from dae91e4d1c7adea85ff97b28dcea72bd234b4bb7)