drm/dp_mst: Rename drm_dp_mst_is_dp_mst_end_device() to be less redundant

It's already prefixed by dp_mst, so we don't really need to repeat
ourselves here. One of the changes I should have picked up originally
when reviewing MST DSC support.

There should be no functional changes here

Cc: Mikita Lipski <mikita.lipski@amd.com>
Cc: Sean Paul <seanpaul@google.com>
Cc: Hans de Goede <hdegoede@redhat.com>
Signed-off-by: Lyude Paul <lyude@redhat.com>
Reviewed-by: Alex Deucher <alexander.deucher@amd.com>
Tested-by: Hans de Goede <hdegoede@redhat.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20200306234623.547525-2-lyude@redhat.com

drivers/gpu/drm/drm_dp_mst_topology.c

@@ -1935,7 +1935,7 @@ static u8 drm_dp_calculate_rad(struct drm_dp_mst_port *port,
 	return parent_lct + 1;
 }
 
-static bool drm_dp_mst_is_dp_mst_end_device(u8 pdt, bool mcs)
+static bool drm_dp_mst_is_end_device(u8 pdt, bool mcs)
 {
 	switch (pdt) {
 	case DP_PEER_DEVICE_DP_LEGACY_CONV:
@@ -1965,13 +1965,13 @@ drm_dp_port_set_pdt(struct drm_dp_mst_port *port, u8 new_pdt,
 
 	/* Teardown the old pdt, if there is one */
 	if (port->pdt != DP_PEER_DEVICE_NONE) {
-		if (drm_dp_mst_is_dp_mst_end_device(port->pdt, port->mcs)) {
+		if (drm_dp_mst_is_end_device(port->pdt, port->mcs)) {
 			/*
 			 * If the new PDT would also have an i2c bus,
 			 * don't bother with reregistering it
 			 */
 			if (new_pdt != DP_PEER_DEVICE_NONE &&
-			    drm_dp_mst_is_dp_mst_end_device(new_pdt, new_mcs)) {
+			    drm_dp_mst_is_end_device(new_pdt, new_mcs)) {
 				port->pdt = new_pdt;
 				port->mcs = new_mcs;
 				return 0;
@@ -1991,7 +1991,7 @@ drm_dp_port_set_pdt(struct drm_dp_mst_port *port, u8 new_pdt,
 	port->mcs = new_mcs;
 
 	if (port->pdt != DP_PEER_DEVICE_NONE) {
-		if (drm_dp_mst_is_dp_mst_end_device(port->pdt, port->mcs)) {
+		if (drm_dp_mst_is_end_device(port->pdt, port->mcs)) {
 			/* add i2c over sideband */
 			ret = drm_dp_mst_register_i2c_bus(&port->aux);
 		} else {
@@ -2172,7 +2172,7 @@ drm_dp_mst_port_add_connector(struct drm_dp_mst_branch *mstb,
 	}
 
 	if (port->pdt != DP_PEER_DEVICE_NONE &&
-	    drm_dp_mst_is_dp_mst_end_device(port->pdt, port->mcs)) {
+	    drm_dp_mst_is_end_device(port->pdt, port->mcs)) {
 		port->cached_edid = drm_get_edid(port->connector,
 						 &port->aux.ddc);
 		drm_connector_set_tile_property(port->connector);