isci: unify phy stop handlers

Merge all implementations in scic_sds_phy_stop(), and kill the state handler
Reported-by: Christoph Hellwig <hch@lst.de>
Signed-off-by: Dan Williams <dan.j.williams@intel.com>

drivers/scsi/isci/phy.h

@@ -511,12 +511,6 @@ typedef enum sci_status (*scic_sds_phy_frame_handler_t)(struct scic_sds_phy *, u
 typedef enum sci_status (*scic_sds_phy_power_handler_t)(struct scic_sds_phy *);
 
 struct scic_sds_phy_state_handler {
-	/**
-	 * The stop_handler specifies the method invoked when there is an
-	 * attempt to stop a phy.
-	 */
-	scic_sds_phy_handler_t stop_handler;
-
 	/**
 	 * The reset_handler specifies the method invoked when there is an
 	 * attempt to reset a phy.