KabylakeOpenBoardPkg: Move flash map to board

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



The flash map currently in KabylakeOpenBoardPkg is only
applicable to the KabylakeRvp3 board. This change moves
the flash map to that board directory to prepare for other
boards to reside in the package.

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>