scsi: ufs: add capability to control the auto bkops during suspend

If host explicitly enables the auto bkops (background operation) on device
then only device would perform the bkops on its own. If auto bkops is not
enabled explicitly and if the device reaches to state where it must do
background operation, device would raise the urgent bkops exception event
to host and then host will enable the auto bkops on device. This patch
adds the option to choose whether auto bkops should be enabled during
runtime suspend or not.

Change-Id: Ib725ad08d5d810a1251c8ae5009504b33b9fcab8
Signed-off-by: Subhash Jadavani <subhashj@codeaurora.org>