scsi: ufs: Scrap Qualcomm's PM QoS implementation

This implementation is completely over the top and wastes lots of CPU
cycles. It's too convoluted to fix, so just scrap it to make way for a
simpler solution. This purges every PM QoS reference in the UFS drivers.

Change-Id: I6b6a585aa975c10dcec5f1d6a0062cc6073ffdf4
Signed-off-by: Sultan Alsawaf <sultan@kerneltoast.com>
Signed-off-by: Alexander Winkowski <dereference23@outlook.com>
Signed-off-by: Pranav Vashi <neobuddy89@gmail.com>