scsi: ufs: power off ufs if device detection fails

Power off (disable clocks, regulators, phy) if the UFS
device detection fails. This saves power while UFS device
is not embedded into the system.

Change-Id: I78512845062e1045967a78a68e54f2aa0d19bfa3
Signed-off-by: Sujit Reddy Thumma <sthumma@codeaurora.org>