scsi: ufs: ufs-exynos: Remove pwr_max from parameter list of exynos_ufs_post_pwr_mode()

pwr_max is unused, remove it.

Link: https://lore.kernel.org/r/20210311042833.1381-1-zbestahu@gmail.com


Signed-off-by: Yue Hu <huyue2@yulong.com>
Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com>