scsi: ufs: return appropriate error code

If link recovery succeeds after a hibern8 exit failure,
return success as the link is active now for use.

Change-Id: I76ac226a2a1e33dd9c6240cac3443a03355bb75e
Signed-off-by: Venkat Gopalakrishnan <venkatg@codeaurora.org>
[cang@codeaurora.org: resolved trivial merge conflicts]
Signed-off-by: Can Guo <cang@codeaurora.org>