OvmfPkg: Add an Super IO bus driver

OvmfPkg: Add an Super IO bus driver

REF:https://bugzilla.tianocore.org/show_bug.cgi?id=1495

There is a plan to remove the IntelFrameworkModulePkg:
https://bugzilla.tianocore.org/show_bug.cgi?id=1605

This patch will a new OVMF Super I/O bus driver which will create the
below child devices:

* COM 1 UART
* COM 2 UART
* PS/2 Keyboard

and installs the Super I/O Protocol on them.

Cc: Jordan Justen <jordan.l.justen@intel.com>
Cc: Ray Ni <ray.ni@intel.com>
Contributed-under: TianoCore Contribution Agreement 1.1
Signed-off-by: Hao Wu <hao.a.wu@intel.com>
Acked-by: Ard Biesheuvel <ard.biesheuvel@linaro.org>
Acked-by: Laszlo Ersek <lersek@redhat.com>
Tested-by: Anthony PERARD <anthony.perard@citrix.com>