IntelSiliconPkg/Feature/SmmAccess: Implement PPI with chipset support

SMRAM must be opened to retrieve the lockbox for S3, and SMM
communication depends on this PPI. For security purposes, SMRAM
lock must be performed before EndOfPei (although FSP notify performs
lockdown too).

It seems to me that this library is generic and applicable to all Intel
platforms in the tree using the MCH SMRAMC register.

Cc: Nate DeSimone <nathaniel.l.desimone@intel.com>
Cc: Ankit Sinha <ankit.sinha@intel.com>
Cc: Ray Ni <ray.ni@intel.com>
Cc: Rangasai V Chaganty <rangasai.v.chaganty@intel.com>
Cc: Isaac Oram <isaac.w.oram@intel.com>
Signed-off-by: Benjamin Doron <benjamin.doron00@gmail.com>
Reviewed-by: Isaac Oram <isaac.w.oram@intel.com>