Revert "disp: msm: dsi: move backlight operations to post kickoff"

This reverts commit e60959b052.

Change-Id: I539522a6a01297fecfafb446a44e725679bc39c0
Signed-off-by: Rajeev Nandan <rajeevny@codeaurora.org>

msm/dsi/dsi_drm.c

@@ -1151,9 +1151,6 @@ int dsi_conn_post_kickoff(struct drm_connector *connector,
 			dsi_ctrl_setup_avr(display->ctrl[i].ctrl, enable);
 	}
 
-	if (display->drm_conn)
-		sde_connector_helper_post_kickoff(display->drm_conn);
-
 	return 0;
 }