[UFS v3] UFS fixes

Jaegeuk Kim
2020-10-24T15:06:52Z

Change log from v2:
- use active_req-- instead of __ufshcd_release to avoid UFS timeout

Change log from v1:
- remove clkgating_enable check in __ufshcd_release
- use __uhfshcd_release instead of active_req.