drm/bochs: Constify function pointer structs

drm/bochs: Constify function pointer structs

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

 drivers/gpu/drm/bochs/bochs-drm.ko:
-.text                        7608
+.text                        7600
-.rodata                       648
+.rodata                       716
-.data                         612
+.data                         544

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/1450178476-26284-14-git-send-email-boris.brezillon@free-electrons.com
Signed-off-by: Daniel Vetter <daniel.vetter@ffwll.ch>