MdeModulePkg: Add ATTRIBUTE (+/-RT, RO) support in PCD declaration in DSC file.

MdeModulePkg: Add ATTRIBUTE (+/-RT, RO) support in PCD declaration in DSC file.

Also update PCD_SERVICE_PEI_VERSION and PCD_SERVICE_DXE_VERSION to match with
the new PcdDataBase binary generated by BaseTools.

Contributed-under: TianoCore Contribution Agreement 1.0
Signed-off-by: Star Zeng <star.zeng@intel.com>
Reviewed-by: Liming Gao <liming.gao@intel.com>
Reviewed-by: Jiewen Yao <jiewen.yao@intel.com>
git-svn-id: https://svn.code.sf.net/p/edk2/code/trunk/edk2@17161 6f19259b-4bc3-4df7-8a09-765794883524