scsi: ufs: Set latency requirement to 44 us

Qualcomm's implementation used the value from device tree node
qcom,pm-qos-cpu-group-latency-us (44 microseconds for sm8150). Set
it manually to match PM QoS requests in other drivers.

Change-Id: I7aa175e90293f369cf4b838c2ff7d6b99177f1a8
Signed-off-by: Alexander Winkowski <dereference23@outlook.com>
Signed-off-by: Pranav Vashi <neobuddy89@gmail.com>