MdeModulePkg/PartitionDxe: Ensure blocksize holds MBR (CVE-2018-12180)

MdeModulePkg/PartitionDxe: Ensure blocksize holds MBR (CVE-2018-12180)

REF:https://bugzilla.tianocore.org/show_bug.cgi?id=1134

The commit adds checks for detecting GPT and MBR partitions.

These checks will ensure that the device block size is big enough to hold
an MBR (512 bytes).

Cc: Jian J Wang <jian.j.wang@intel.com>
Cc: Star Zeng <star.zeng@intel.com>
Cc: Laszlo Ersek <lersek@redhat.com>
Contributed-under: TianoCore Contribution Agreement 1.1
Signed-off-by: Hao Wu <hao.a.wu@intel.com>
Reviewed-by: Ray Ni <ray.ni@intel.com>