xen/x86: Call xen_smp_intr_init_pv() on BSP

Recent code rework that split handling ov PV, HVM and PVH guests into
separate files missed calling xen_smp_intr_init_pv() on CPU0.

Add this call.
Signed-off-by: Boris Ostrovsky <boris.ostrovsky@oracle.com>
Reported-by: Sander Eikelenboom <linux@eikelenboom.it>
Signed-off-by: Juergen Gross <jgross@suse.com>

arch/x86/xen/smp_pv.c

@@ -249,7 +249,7 @@ static void __init xen_pv_smp_prepare_cpus(unsigned int max_cpus)
 
 	xen_pmu_init(0);
 
-	if (xen_smp_intr_init(0))
+	if (xen_smp_intr_init(0) || xen_smp_intr_init_pv(0))
 		BUG();
 
 	if (!alloc_cpumask_var(&xen_cpu_initialized_map, GFP_KERNEL))