mmc: core: implemented RPMB partition support

mmc: core: implemented RPMB partition support

BZ: 18193

eMMC card has RPMB partition, which is used for user to store some security
data. Right now Chabbi will use this partition and need MMC driver to support
this.

This patch implements the RPMB support from driver level

Change-Id: I04c0a3aed3adb99205eb3ec61ce6e24a78d4d908
Signed-off-by: Chuanxiao Dong <chuanxiao.dong@intel.com>
Reviewed-on: http://android.intel.com:8080/29703
Tested-by: Sun, Jianhua <jianhua.sun@intel.com>
Reviewed-by: Tang, Richard <richard.tang@intel.com>
Reviewed-by: buildbot <buildbot@intel.com>
Tested-by: buildbot <buildbot@intel.com>