drm/i2c/ch7006: Constify function pointer structs

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

 drivers/gpu/drm/i2c/ch7006.ko:
-.text                        5752
+.text                        5760
-.rodata                      6608
+.rodata                      6656
-.data                         216
+.data                         168

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/1450178476-26284-17-git-send-email-boris.brezillon@free-electrons.com
Signed-off-by: Daniel Vetter <daniel.vetter@ffwll.ch>

drivers/gpu/drm/i2c/ch7006_drv.c

@@ -371,7 +371,7 @@ static int ch7006_encoder_set_property(struct drm_encoder *encoder,
 	return 0;
 }
 
-static struct drm_encoder_slave_funcs ch7006_encoder_funcs = {
+static const struct drm_encoder_slave_funcs ch7006_encoder_funcs = {
 	.set_config = ch7006_encoder_set_config,
 	.destroy = ch7006_encoder_destroy,
 	.dpms = ch7006_encoder_dpms,