MAINTAINERS: Update UFS maintainer

Dropping Faiz Abbas from the UFS maintainer list as his e-mail ID is no
longer valid.

Adding Bhupesh Sharma who has been using this framework working on
Qualcomm Snapdragon SoCs as well as sending out fixes.

Adding myself as well to support in reviewing and testing patches.

Signed-off-by: Neha Malcom Francis <n-francis@ti.com>
Reviewed-by: Nishanth Menon <nm@ti.com>
Cc: Bhupesh Sharma <bhupesh.sharma@linaro.org>
Cc: Vignesh R <vigneshr@ti.com>