scsi: ufs: fix leakage during link off state

Currently when we try to put the link in off/disabled state during suspend,
it seems link is not being kept in low power mode. This patch fixes the
issue by putting the link in hibern8 first (so device also puts the link in
low power mode) and then stop the host controller.

Change-Id: I157c0c0c246fb83692b57a3d8f5a7868c0703cf0
Signed-off-by: Subhash Jadavani <subhashj@codeaurora.org>