drm/armada: armada_output: Remove some unused functions

Removes some functions that are not used anywhere:
armada_drm_encoder_mode_fixup() armada_drm_encoder_commit() armada_drm_encoder_prepare()

This was partially found by using a static code analysis program called cppcheck.
Signed-off-by: Rickard Strandqvist <rickard_strandqvist@spectrumdigital.se>
Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>

drivers/gpu/drm/armada/armada_output.c

@@ -72,22 +72,6 @@ static const struct drm_connector_funcs armada_drm_conn_funcs = {
 	.set_property	= armada_drm_connector_set_property,
 };
 
-void armada_drm_encoder_prepare(struct drm_encoder *encoder)
-{
-	encoder_helper_funcs(encoder)->dpms(encoder, DRM_MODE_DPMS_OFF);
-}
-
-void armada_drm_encoder_commit(struct drm_encoder *encoder)
-{
-	encoder_helper_funcs(encoder)->dpms(encoder, DRM_MODE_DPMS_ON);
-}
-
-bool armada_drm_encoder_mode_fixup(struct drm_encoder *encoder,
-	const struct drm_display_mode *mode, struct drm_display_mode *adjusted)
-{
-	return true;
-}
-
 /* Shouldn't this be a generic helper function? */
 int armada_drm_slave_encoder_mode_valid(struct drm_connector *conn,
 	struct drm_display_mode *mode)

drivers/gpu/drm/armada/armada_output.h

@@ -21,12 +21,6 @@ struct armada_output_type {
 
 struct drm_encoder *armada_drm_connector_encoder(struct drm_connector *conn);
 
-void armada_drm_encoder_prepare(struct drm_encoder *encoder);
-void armada_drm_encoder_commit(struct drm_encoder *encoder);
-
-bool armada_drm_encoder_mode_fixup(struct drm_encoder *encoder,
-	const struct drm_display_mode *mode, struct drm_display_mode *adj);
-
 int armada_drm_slave_encoder_mode_valid(struct drm_connector *conn,
 	struct drm_display_mode *mode);