scsi: MAINTAINERS: Add reviewers for UFS patches

According to git log and the linux-scsi archives, Vinayak has been inactive
for several years. Removing him as maintainer will make the
get_maintainer.pl script generate an extensive list of recipients.  Add
three reviewers as well to vet future UFS patches.

Signed-off-by: Marc Gonzalez <marc.w.gonzalez@free.fr>
Acked-by: Joao Pinto <jpinto@synopsys.com>
Acked-by: Avri Altman <avri.altman@wdc.com>
Acked-by: Alim Akhtar <alim.akhtar@samsung.com>
Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com>