IntelSiliconPkg: Add library header files

REF: https://bugzilla.tianocore.org/show_bug.cgi?id=2587



SmmAccessLib.h and ConfigBlockLib.h is the primary header file in
IntelSiliconPkg.

Cc: Ray Ni <ray.ni@intel.com>
Cc: Rangasai V Chaganty <rangasai.v.chaganty@intel.com>
Signed-off-by: Guomin Jiang <guomin.jiang@intel.com>
Reviewed-by: Ray Ni <ray.ni@intel.com>