OvmfPkg/EnrollDefaultKeys: refresh INF file

OvmfPkg/EnrollDefaultKeys: refresh INF file

Bump INF_VERSION to the latest edk2 INF specification.

Regenerate FILE_GUID to distinguish this application from downstream-only
versions.

Remove the VALID_ARCHITECTURES comment as there is nothing ISA or platform
specific in the application.

Ensure all sections apart from [Defines] are alphabetically sorted.

Cc: Anthony Perard <anthony.perard@citrix.com>
Cc: Ard Biesheuvel <ard.biesheuvel@linaro.org>
Cc: Jordan Justen <jordan.l.justen@intel.com>
Cc: Julien Grall <julien.grall@arm.com>
Bugzilla: https://bugzilla.tianocore.org/show_bug.cgi?id=1747
Signed-off-by: Laszlo Ersek <lersek@redhat.com>
Reviewed-by: Philippe Mathieu-Daude <philmd@redhat.com>
Acked-by: Ard Biesheuvel <ard.biesheuvel@linaro.org>
Reviewed-by: Gary Lin <glin@suse.com>