libqos: define SPAPR libqos functions

Define spapr_alloc_init()/spapr_alloc_init_flags()/spapr_alloc_uninit()

  to allocate and use SPAPR guest memory

Define qtest_spapr_vboot()/qtest_spapr_boot()/qtest_spapr_shutdown()

  to start SPAPR guest with QOSState initialized for it (memory management)

Move qtest_irq_intercept_in() from generic part to PC part.

Signed-off-by: Laurent Vivier <lvivier@redhat.com>
Reviewed-by: Greg Kurz <groug@kaod.org>
Reviewed-by: David Gibson <david@gibson.dropbear.id.au>
Signed-off-by: David Gibson <david@gibson.dropbear.id.au>
