ACPI: SPCR: extend XGENE 8250 workaround to m400

xgene v1/v2 chips are also used on moonshot cartridges that have
different table headers to the ones on Mustang. Extend the quirk
so it also recognises the Moonshot M400 variant too.

Signed-off-by: Graeme Gregory <graeme.gregory@linaro.org>
Tested-by: Mark Salter <msalter@redhat.com>
Reviewed-by: Mark Salter <msalter@redhat.com>
Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>