scsi: ufs: changing maintainer

As per internal decision, Joao Pinto will be maintainer for DWC UFS
driver.

Signed-off-by: Prabu Thangamuthu <prabut@synopsys.com>
Acked-by: Joao Pinto <Joao.Pinto@synopsys.com>
Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com>