Revert "Revert "FROMLIST: scsi: ufs: export hibern8 entry and exit""

This reverts commit 0990eff7509fecafad9a44a56801c97e8e8ce9c6 which was a
revert of commit 38c1605e.

We need these symbols back, so add the patch back.

Bug: 143136976
Cc: Asutosh Das <asutoshd@codeaurora.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@google.com>
Change-Id: I39f86820c3b0e5901006c588870d5efeda2e92f0