MdeModulePkg/SdMmcPciHcDxe: Fix VS2015 IA32 NOOPT build failure

MdeModulePkg/SdMmcPciHcDxe: Fix VS2015 IA32 NOOPT build failure

REF:https://bugzilla.tianocore.org/show_bug.cgi?id=1425

This commit will resolve the VS2015 IA32 NOOPT build failure within
SdMmcPciHcDxe.

More specifically, this commit will use BaseLib API RShiftU64() to perform
right-shift operations for UINT64 type operators.

Cc: Ruiyu Ni <ruiyu.ni@intel.com>
Contributed-under: TianoCore Contribution Agreement 1.1
Signed-off-by: Hao Wu <hao.a.wu@intel.com>
Reviewed-by: Bi Dandan <dandan.bi@intel.com>
Reviewed-by: Jian J Wang <jian.j.wang@intel.com>