qemu: Use '-machine acpi=on/off' instead of deprecated '-no-acpi'

qemu: Use '-machine acpi=on/off' instead of deprecated '-no-acpi'

QEMU deprecated the '-no-acpi' option, thus we should switch to the
modern way to use '-machine'.

Certain ARM machine types don't support ACPI. Given our historically
broken design of using '<acpi/>' without attribute to enable ACPI and
qemu's default of enabling it without '-no-acpi' such configurations
would not work.

Now when qemu reports whether given machine type supports ACPI we can do
a better decision and un-break those configs. Unfortunately not
retroactively.

Resolves: https://gitlab.com/libvirt/libvirt/-/issues/297
Signed-off-by: Peter Krempa <pkrempa@redhat.com>
Reviewed-by: Ján Tomko <jtomko@redhat.com>