UPSTREAM: drm/rockchip: Constify function pointer structs

UPSTREAM: drm/rockchip: Constify function pointer structs

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

 drivers/gpu/drm/rockchip/dw_hdmi-rockchip.ko:
-.rodata                      772
+.rodata                      828
-.data                        148
+.data                         92

 drivers/gpu/drm/rockchip/rockchipdrm.ko:
-.rodata                      748
+.rodata                      760
-.data                        448
+.data                        436

Change-Id: Ic93fc8d334a51618ea8075b4344983b795c7623e
Signed-off-by: Mark Yao <mark.yao@rock-chips.com>
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/1450178476-26284-25-git-send-email-boris.brezillon@free-electrons.com
Signed-off-by: Daniel Vetter <daniel.vetter@ffwll.ch>
(cherry picked from commit 28c508ece6831e49d36cfa868f2a6c9d9f1c920e)