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/sde/sde_connector.h

@@ -1099,10 +1099,4 @@ int sde_connector_get_panel_vfp(struct drm_connector *connector,
  */
 int sde_connector_esd_status(struct drm_connector *connector);
 
-/**
- * sde_connector_helper_post_kickoff - helper function for drm connector post kickoff
- * @connector: Pointer to DRM connector object
- */
-void sde_connector_helper_post_kickoff(struct drm_connector *connector);
-
 #endif /* _SDE_CONNECTOR_H_ */