mmc: host: use spinlock to lock across the acquire ownership

mmc: host: use spinlock to lock across the acquire ownership

BZ: 42752

use spin lock to across the acquiring ownership to protect IA threads
compete

Change-Id: I1492b5fad0d309efb812adab37fa45744adccb52
Signed-off-by: Chuanxiao Dong <chuanxiao.dong@intel.com>
Reviewed-on: http://android.intel.com:8080/53370
Reviewed-by: Zhang, Yanmin <yanmin.zhang@intel.com>
Tested-by: Sun, Jianhua <jianhua.sun@intel.com>
Reviewed-by: Koskinen, Ilkka <ilkka.koskinen@intel.com>
Reviewed-by: Tang, Richard <richard.tang@intel.com>
Reviewed-by: buildbot <buildbot@intel.com>
Tested-by: buildbot <buildbot@intel.com>