drm/msm/dp: remove dp_display_en/disable prototypes and data argument

Remove unused dp_display_en/disable prototypes. While we are at it,
remove extra 'data' argument that is unused.

Signed-off-by: Dmitry Baryshkov <[e-mail]>
Reviewed-by: Kuogee Hsieh <[e-mail]>
Patchwork: https://patchwork.freedesktop.org/patch/490104/
Link: https://lore.kernel.org/r/[e-mail]
Signed-off-by: Rob Clark <[e-mail]>

drivers/gpu/drm/msm/dp/dp_display.c

···
 	return 0;
 };
 
-static int dp_display_enable(struct dp_display_private *dp, bool force_link_train);
-static int dp_display_disable(struct dp_display_private *dp, u32 data);
-
 static void dp_display_handle_plugged_change(struct msm_dp *dp_display,
 		bool plugged)
 {
···
 	return 0;
 }
 
-static int dp_display_disable(struct dp_display_private *dp, u32 data)
+static int dp_display_disable(struct dp_display_private *dp)
 {
 	struct msm_dp *dp_display = &dp->dp_display;
 
···
 	rc = dp_display_post_enable(dp);
 	if (rc) {
 		DRM_ERROR("DP display post enable failed, rc=%d\n", rc);
-		dp_display_disable(dp_display, 0);
+		dp_display_disable(dp_display);
 	}
 
 	/* completed connection */
···
 		return;
 	}
 
-	dp_display_disable(dp_display, 0);
+	dp_display_disable(dp_display);
 
 	state =  dp_display->hpd_state;
 	if (state == ST_DISCONNECT_PENDING) {