scsi: ufs: core: mcq: Use shared tags for MCQ mode

Enable shared tags for MCQ. For UFS, this should not have a huge
performance impact. It however simplifies the MCQ implementation and reuses
most of the existing code in the issue and completion path.  Also add
multiple queue mapping to map_queue().

Co-developed-by: Can Guo <quic_cang@quicinc.com>
Signed-off-by: Can Guo <quic_cang@quicinc.com>
Signed-off-by: Asutosh Das <quic_asutoshd@quicinc.com>
Reviewed-by: Bart Van Assche <bvanassche@acm.org>
Reviewed-by: Manivannan Sadhasivam <mani@kernel.org>
Reviewed-by: Stanley Chu <stanley.chu@mediatek.com>
Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com>