MdeModulePkg PCD: Update PCD database structure definition to match BaseTools

MdeModulePkg PCD: Update PCD database structure definition to match BaseTools

To follow PI1.4a, BaseTools has be updated to fix artificial limitation of
SkuId range.

This patch is to update PCD database structure definition to match BaseTools.

Note: The source code and BaseTools need to be upgraded at the same time,
and if they are not upgraded at the same time, build error like below will
be triggered to help user identify the problem.

"Please make sure the version of PCD PEIM Service and the generated
PCD PEI Database match."

Cc: Liming Gao <liming.gao@intel.com>
Cc: Yonghong Zhu <yonghong.zhu@intel.com>
Contributed-under: TianoCore Contribution Agreement 1.0
Signed-off-by: Star Zeng <star.zeng@intel.com>
Reviewed-by: Liming Gao <liming.gao@intel.com>