scsi: ufs: Utilize Transfer Request List Completion Notification Register

By reading the UTP Transfer Request List Completion Notification Register,
which is added in UFSHCI Ver 3.0, SW can easily get the compeleted transfer
requests. Thus, SW can get rid of host lock, which is used to synchronize
the tr_doorbell and outstanding_reqs, on transfer requests dispatch and
completion paths. This can further benefit random read/write performance.

Link: https://lore.kernel.org/r/[email protected]
Cc: Stanley Chu <[email protected]>
Reviewed-by: Stanley Chu <[email protected]>
Reviewed-by: Bean Huo <[email protected]>
Co-developed-by: Asutosh Das <[email protected]>
Signed-off-by: Asutosh Das <[email protected]>
Signed-off-by: Can Guo <[email protected]>
Signed-off-by: Martin K. Petersen <[email protected]>

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