scsi: ufs: core: Add CPU latency QoS support for UFS driver

Register UFS driver to CPU latency PM QoS framework to improve UFS device
random I/O performance.

PM QoS initialization will insert new QoS request into the CPU latency QoS
list with the maximum latency PM_QOS_DEFAULT_VALUE value.

The 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. Also provide a sysfs interface to enable/disable PM
QoS feature.

tiotest benchmark tool I/O performance results on sm8550 platform:

1. Without PM QoS support
	Type (Speed in)    | Average of 18 iterations
	Random Write(IPOS) | 41065.13
	Random Read(IPOS)  | 37101.3

2. With PM QoS support
	Type (Speed in)    | Average of 18 iterations
	Random Write(IPOS) | 46784.9
	Random Read(IPOS)  | 42943.4

(Improvement with PM QoS = ~15%).

Reviewed-by: Peter Wang <peter.wang@mediatek.com>
Reviewed-by: AngeloGioacchino Del Regno <angelogioacchino.delregno@collabora.com>
Co-developed-by: Nitin Rawat <quic_nitirawa@quicinc.com>
Signed-off-by: Nitin Rawat <quic_nitirawa@quicinc.com>
Co-developed-by: Naveen Kumar Goud Arepalli <quic_narepall@quicinc.com>
Signed-off-by: Naveen Kumar Goud Arepalli <quic_narepall@quicinc.com>
Signed-off-by: Maramaina Naresh <quic_mnaresh@quicinc.com>
Link: https://lore.kernel.org/r/20231219123706.6463-2-quic_mnaresh@quicinc.com


Reviewed-by: Bart Van Assche <bvanassche@acm.org>
Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com>