mmc: panic_ops: release Dekker mutex during ipanic saving

mmc: panic_ops: release Dekker mutex during ipanic saving

BZ: 42244

panic_ops: release Dekker mutex during ipanic saving

Change-Id: I675e033887244714cc8d6e720e1ce195cc76dd86
Signed-off-by: Chuanxiao Dong <chuanxiao.dong@intel.com>
Reviewed-on: http://android.intel.com:8080/53044
Reviewed-by: Koskinen, Ilkka <ilkka.koskinen@intel.com>
Reviewed-by: Berthier, Emmanuel <emmanuel.berthier@intel.com>
Reviewed-by: Tang, Richard <richard.tang@intel.com>
Reviewed-by: Lebouc, Christophe <christophe.lebouc@intel.com>
Tested-by: Lebouc, Christophe <christophe.lebouc@intel.com>
Tested-by: Sun, Jianhua <jianhua.sun@intel.com>
Reviewed-by: buildbot <buildbot@intel.com>
Tested-by: buildbot <buildbot@intel.com>