scsi: ufs: ufs-exynos: Add refclkout_stop control

This patch adds REFCLKOUT_STOP control to CLK_STOP_MASK. This permits
enabling/disabling reference clock out control for the UFS device.

Link: https://lore.kernel.org/r/20211018124216.153072-6-chanho61.park@samsung.com


Reviewed-by: Alim Akhtar <alim.akhtar@samsung.com>
Signed-off-by: Chanho Park <chanho61.park@samsung.com>
Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com>