drm/armada: Remove dummy ->load_lut() implementation

The ->load_lut() callback is optional, therefore a dummy implementation
is not needed.

Cc: Russell King <rmk+kernel@arm.linux.org.uk>
Signed-off-by: Thierry Reding <treding@nvidia.com>
Signed-off-by: Daniel Vetter <daniel.vetter@ffwll.ch>

drivers/gpu/drm/armada/armada_crtc.c

@@ -653,10 +653,6 @@ static int armada_drm_crtc_mode_set_base(struct drm_crtc *crtc, int x, int y,
 	return 0;
 }
 
-static void armada_drm_crtc_load_lut(struct drm_crtc *crtc)
-{
-}
-
 /* The mode_config.mutex will be held for this call */
 static void armada_drm_crtc_disable(struct drm_crtc *crtc)
 {
@@ -678,7 +674,6 @@ static const struct drm_crtc_helper_funcs armada_crtc_helper_funcs = {
 	.mode_fixup	= armada_drm_crtc_mode_fixup,
 	.mode_set	= armada_drm_crtc_mode_set,
 	.mode_set_base	= armada_drm_crtc_mode_set_base,
-	.load_lut	= armada_drm_crtc_load_lut,
 	.disable	= armada_drm_crtc_disable,
 };