KabylakeOpenBoardPkg: Add board ID to Global NVS

REF:https://bugzilla.tianocore.org/show_bug.cgi?id=2207



Adds the board ID as a field in global NVS (BDID) to allow ACPI code
to take conditional actions based on the active board.

Cc: Chasel Chiu <chasel.chiu@intel.com>
Cc: Nate DeSimone <nathaniel.l.desimone@intel.com>
Cc: Ankit Sinha <ankit.sinha@intel.com>
Cc: Jeremy Soller <jeremy@system76.com>
Signed-off-by: Michael Kubacki <michael.a.kubacki@intel.com>
Reviewed-by: Chasel Chiu <chasel.chiu@intel.com>
Reviewed-by: Ankit Sinha <ankit.sinha@intel.com>