Note that we've seen WAET tables in the SDT signature list

This is a new (to QEMU) table that isn't detailed in the current version of
the ACPI spec. Not sure when Microsoft dreampt it up, but it looks like it
was added to QEMU earlier this year.

acpi/src/sdt.rs

@@ -56,6 +56,9 @@ impl<T: Copy, const MIN_VERSION: u8> ExtendedField<T, MIN_VERSION> {
 ///     "SRAT" - System Resource Affinity Table
 ///     "SSDT" - Secondary System Description Table
 ///     "XSDT" - eXtended System Descriptor Table
+///
+/// We've come across some more ACPI tables in the wild:
+///     "WAET" - Windows ACPI Emulated device Table
 #[derive(Clone, Copy)]
 #[repr(C, packed)]
 pub struct SdtHeader {