Register ufs driver to CPU latency PM QoS framework to improve
ufs device random io performance.
PM QoS initialization will insert new QoS request into the CPU
latency QoS list with the maximum latency PM_QOS_DEFAULT_VALUE
value.
UFS driver will vote for performance mode on scale up and power
save mode for scale down.
If clock scaling feature is not enabled then voting will be based
on clock on or off condition.