KabylakeOpenBoardPkg: Add PeiSerialPortLibSpiFlash

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



PeiSerialPortLibSpiFlash is currently used for early boot closed
chassis debug on production systems such as the System 76 Galago Pro
laptop. This change moves the library to KabylakeOpenBoardPkg from
ClevoOpenBoardPkg since the Clevo package is being removes for
code consolidation.

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: Nate DeSimone <nathaniel.l.desimone@intel.com>
Reviewed-by: Ankit Sinha <ankit.sinha@intel.com>
Reviewed-by: Jeremy Soller <jeremy@system76.com>