scsi: ufs: remove the duplicated checking for supporting clkscaling

There are same conditions for checking whether supporting clkscaling or
not. When ufshcd is supporting clkscaling, active_reqs should be
decreased by one.

[mkp: addressed comment from Bartlomiej]

Signed-off-by: Jaehoon Chung <jh80.chung@samsung.com>
Reviewed-by: Subhash Jadavani <subhashj@codeaurora.org>
Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com>