scsi: ufs: dump hw regs on link failures

Dump host state, power info and host/vendor specific registers
on link failures. This provides useful info to debug the failures.

Change-Id: I76a4ea56f3aee6a51a5930381ad8d12ca8b43551
Signed-off-by: Venkat Gopalakrishnan <venkatg@codeaurora.org>