mmc: core: update AUTO_EN in BKOPS_EN field on runtime resume

On runtime suspend flow, AUTO_EN must be turned off (see eMMC 5.1
specification 6.6.28). During runtime resume, it should be restored again.
When partial card initialization flow is used on runtime resume (instead of
full card initialization), this flow should restore AUTO_EN bit if needed.

CRs-Fixed: 979630
Change-Id: I4ac3b7c45fdba36d014f4c88cb704bbf36011d59
Signed-off-by: Konstantin Dorfman <kdorfman@codeaurora.org>