scsi: ufs: Crash the system on unrecoverable state

If we have hit fatal errors and are not able to recover using
a reset, crash the system instead of proceeding and causing
further system failures.

Change-Id: I01820e4e8d3d3b603f16b615ae475095c3a417dd
Signed-off-by: Venkat Gopalakrishnan <venkatg@codeaurora.org>