src: introduce 'raw' and 'rawset' ACPI table types

src: introduce 'raw' and 'rawset' ACPI table types

The QEMU driver has only accepted type=slic even though QEMU is able to
accept individual tables of any type, without needing to specify a
signature. Introduce type=raw to address this usage scenario. Contrary
to other types, this one may appear multiple times.

The Xen driver has mistakenly accepted type=slic and use it to set the
Xen acpi_firmware setting, which performs a simple passthrough of
multiple concatenated data table. Introduce type=rawset to address
this usage scenario.

Reviewed-by: Michal Privoznik <mprivozn@redhat.com>
Signed-off-by: Daniel P. Berrangé <berrange@redhat.com>