ppc/spapr: remove deprecated machine pseries-3.1

pseries-3.1 had been deprecated and due for removal now as per policy.
Also remove backward compatibility flags and related code introduced for
pre pseries-4.0 machines.

Suggested-by: Cédric Le Goater <clg@kaod.org>
Reviewed-by: Cédric Le Goater <clg@redhat.com>
Signed-off-by: Philippe Mathieu-Daudé <philmd@linaro.org>
Link: https://lore.kernel.org/qemu-devel/20251021084346.73671-4-philmd@linaro.org
Signed-off-by: Harsh Prateek Bora <harshpb@linux.ibm.com>
3 files changed