seabios: stop updating aml files

seabios: stop updating aml files

ACPI aml files traditionally have been managed in the seabios repo.
In qemu version 2.0 we've switched over to have qemu generate the
acpi tables and provide them to the firmware via fw_cfg.

The old aml files are still there and used for old machine types.
Well, actually the q35 file only, the piix4 version is compiled into
seabios (unless built with CONFIG_ACPI_DSDT=n) and is there for
reference only.

The aml files havn't been touched for a long time, and given that
new features requiring acpi changes are typically only added to new
machine types this is unlikely to change in the future.  So stop
updating them.

That allows to cleanup things a bit on the seabios side in the future.

Signed-off-by: Gerd Hoffmann <kraxel@redhat.com>