scsi: ufs: core: Fix a typo in ufs-sysfs.c

Fix the following typo:

 ufschd_uic_link_state_to_string() -> ufshcd_uic_link_state_to_string()
 ufschd_ufs_dev_pwr_mode_to_string() -> ufshcd_ufs_dev_pwr_mode_to_string()

Link: https://lore.kernel.org/r/1381713434.61619509208911.JavaMail.epsvc@epcpadp3
Signed-off-by: Keoseong Park <keosung.park@samsung.com>
Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com>