Add some #includes after things got broken with the last round of

MI include file (<sys/smp.h> I think) tweaks.

sys/ia64/ia64/nexus.c

@@ -49,6 +49,7 @@
 #include <machine/bus.h>
 #include <sys/rman.h>
 #include <sys/interrupt.h>
+#include <machine/intr.h>
 
 #include <machine/vmparam.h>
 #include <vm/vm.h>

sys/ia64/ia64/sapic.c

@@ -34,6 +34,8 @@
 #include <sys/systm.h>
 #include <machine/sapicvar.h>
 #include <machine/sapicreg.h>
+#include <sys/bus.h>
+#include <machine/intr.h>
 
 static MALLOC_DEFINE(M_SAPIC, "sapic", "I/O SAPIC devices");