scsi: ufs: remove redundant condition for power change

The removed condition is already checked inside the routine
ufshcd_change_power_mode().

Also, a minor typo is fixed.

Change-Id: Ib238ff9c4bdcd380406505d5319bd2d6c0ed6063
Signed-off-by: Yaniv Gardi <ygardi@codeaurora.org>