Panic: mmc: SDHCI: implement panic ops for MFLD SDHCI driver

Panic: mmc: SDHCI: implement panic ops for MFLD SDHCI driver

BZ: 16578

Port this patch from R2

This patch will implement the panic ops for MFLD sdhci host driver.
The original sdhci host driver was using interrupt mode which is not
preferred in panic mode. So implemented another ops which will use
polling mode instead

Change-Id: I4d808405eadd7565141f3bf8e1531148e6c0fc9a
Signed-off-by: Chuanxiao Dong <chuanxiao.dong@intel.com>
Reviewed-on: http://android.intel.com:8080/26321
Reviewed-by: Gross, Mark <mark.gross@intel.com>
Reviewed-by: Yang, Fei <fei.yang@intel.com>
Tested-by: Sun, Jianhua <jianhua.sun@intel.com>
Reviewed-by: buildbot <buildbot@intel.com>
Tested-by: buildbot <buildbot@intel.com>