scsi: ufs-qcom: add qos support for ufs

Adds support for QoS.
At init, vote for maximum latency S32_MAX.
Schedule a vote of PERF when a request is received.
Update the vote to S32_MAX during clock gating.

Change-Id: I91ed683880a00493f4bd510689e5037939ce6661
Signed-off-by: Asutosh Das <asutoshd@codeaurora.org>