ppc/xive2: redistribute irqs for pool and phys ctx pull

ppc/xive2: redistribute irqs for pool and phys ctx pull

When disabling (pulling) an xive interrupt context, we need
to redistribute any active group interrupts to other threads
that can handle the interrupt if possible.  This support had
already been added for the OS context but had not yet been
added to the pool or physical context.

Signed-off-by: Glenn Miles <milesg@linux.ibm.com>
Reviewed-by: Michael Kowal <kowal@linux.ibm.com>
Tested-by: Gautam Menghani <gautam@linux.ibm.com>
Link: https://lore.kernel.org/qemu-devel/20250512031100.439842-28-npiggin@gmail.com
Signed-off-by: Cédric Le Goater <clg@redhat.com>