{Platform,Silicon}/Intel: Move PcdAcpiBaseAddress definition

All these platforms have an ABase, so move the definition to enable
common silicon code in IntelSiliconPkg. Otherwise, library shims would
be required, because PCDs are GUID-ed and package DEC specific.

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