scsi: ufs: core: Remove dedicated hwq for dev command

scsi: ufs: core: Remove dedicated hwq for dev command

This commit depends on "scsi: ufs: core: mcq: Fix the incorrect OCS value
for the device command" which takes care of the OCS value of dev commands
in MCQ mode.

It is safe to share first hwq for dev command and I/O request here.

Tested-by: Po-Wen Kao <powen.kao@mediatek.com>
Signed-off-by: Po-Wen Kao <powen.kao@mediatek.com>
Link: https://lore.kernel.org/r/20230610021553.1213-3-powen.kao@mediatek.com
Reviewed-by: Stanley Chu <stanley.chu@mediatek.com>
Reviewed-by: Bart Van Assche <bvanassche@acm.org>
Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com>