BaseTools/Build: Add SDL support

BaseTools/Build: Add SDL support

1.BaseTool add ATTRIBUTE (+/-RT, RO) support in PCD declaration in DSC file
2.BaseTool collect valid PCD value in DEC file and generate data base for runtime sanity check
3.BaseTool support SetPcd error.

Contributed-under: TianoCore Contribution Agreement 1.0
Signed-off-by: "Bob Feng" <bob.c.feng@intel.com>
Reviewed-by: "Chen, Hesheng" <hesheng.chen@intel.com>
Reviewed-by: "Liu, Yingke D" <yingke.d.liu@intel.com>
git-svn-id: https://svn.code.sf.net/p/edk2/code/trunk/edk2@17158 6f19259b-4bc3-4df7-8a09-765794883524