scsi: MAINTAINERS: Add myself as the maintainer for Qcom UFS drivers

Qcom UFS drivers are left unmaintained till now. I'd like to step up to
maintain the drivers and the binding.

Acked-by: Bjorn Andersson <andersson@kernel.org>
Signed-off-by: Manivannan Sadhasivam <manivannan.sadhasivam@linaro.org>
Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com>