hw/ppc/e500: Check for compatible CPU type instead of aborting ungracefully

hw/ppc/e500: Check for compatible CPU type instead of aborting ungracefully

When using the ppce500 machine with an embedded CPU type that has
the right MMU model, but is not part of the e500 CPU family, QEMU
currently aborts ungracefully:

 $ ./qemu-system-ppc -machine ppce500 -cpu e200z5 -nographic
 qemu-system-ppc: ../qemu/hw/core/gpio.c:108: qdev_get_gpio_in_named:
  Assertion `n >= 0 && n < gpio_list->num_in' failed.
 Aborted (core dumped)

The ppce500 machine expects a CPU with certain GPIO interrupt pins,
so let's replace the coarse check for the MMU_BOOKE206 model with
a more precise check that only allows CPUs from the e500 family.

Resolves: https://gitlab.com/qemu-project/qemu/-/issues/3162
Signed-off-by: Thomas Huth <thuth@redhat.com>
Acked-by: Bernhard Beschow <shentey@gmail.com>
Reviewed-by: Harsh Prateek Bora <harshpb@linux.ibm.com>
Reviewed-by: BALATON Zoltan <balaton@eik.bme.hu>
Message-ID: <20251015111243.1585018-1-thuth@redhat.com>
Signed-off-by: Philippe Mathieu-Daudé <philmd@linaro.org>