mmc: core: fix bkops init for cmdq

It is needed to initialize auto bkops before enabling
command queueing since the initialization uses CMD6 which
may not be called when cmdq is enabled.

Change-Id: Idecff761754fe394c01425e7fd4dd5f6a083135d
Signed-off-by: Dov Levenglick <dovl@codeaurora.org>