scsi: ufs: Abort gating if clock on request is pending

This change attempts to abort gating of clocks if a
request to turn-on clocks is pending.
This would in turn avoid turning OFF and back ON the
clocks.

CRs-fixed: 2002742
Change-Id: I3d80ed503d4ddb29ac613b11e5e93f84c8362978
Signed-off-by: Asutosh Das <asutoshd@codeaurora.org>
[cang@codeaurora.org: Resolved trivial merge conflicts]
Signed-off-by: Can Guo <cang@codeaurora.org>