IntelFsp2Pkg: Add FspmArchConfigPpi to support Dispatch mode

IntelFsp2Pkg: Add FspmArchConfigPpi to support Dispatch mode

REF: https://bugzilla.tianocore.org/show_bug.cgi?id=1381

In Dispatch mode FSP may consume PPI directly so creating
FSPM_ARCH_CONFIG_PPI to align with FSPM_ARCH_UPD.
Also Keeps new structure size 8 bytes alignment as other
structures.

Test: Verified on internal platform to boot with this PPI
installed successfully.

Cc: Nate DeSimone <nathaniel.l.desimone@intel.com>
Cc: Star Zeng <star.zeng@intel.com>
Contributed-under: TianoCore Contribution Agreement 1.1
Signed-off-by: Chasel Chiu <chasel.chiu@intel.com>
Reviewed-by: Nate DeSimone <nathaniel.l.desimone@intel.com>
Reviewed-by: Star Zeng <star.zeng@intel.com>