IntelFsp2WrapperPkg: Implement FSP 2.4 MultiPhase wrapper handlers.

IntelFsp2WrapperPkg: Implement FSP 2.4 MultiPhase wrapper handlers.

REF: https://bugzilla.tianocore.org/show_bug.cgi?id=3916

Implement MultiPhase wrapper handlers and only call to MultiPhase
handlers when FSP supports.

Cc: Nate DeSimone <nathaniel.l.desimone@intel.com>
Cc: Star Zeng <star.zeng@intel.com>
Signed-off-by: Chasel Chiu <chasel.chiu@intel.com>
Reviewed-by: Nate DeSimone <nathaniel.l.desimone@intel.com>