x86: lguest build fix

Fix this error (i386 !SMP build):

arch/x86/lguest/boot.c: In function lguest_init:
arch/x86/lguest/boot.c:1059: error: pm_power_off undeclared (first use in this function)

by including linux/pm.h.
Signed-off-by: NJeff Garzik <jgarzik@redhat.com>
Signed-off-by: NIngo Molnar <mingo@elte.hu>
Signed-off-by: NThomas Gleixner <tglx@linutronix.de>

arch/x86/lguest/boot.c

@@ -56,6 +56,7 @@
 #include <linux/lguest.h>
 #include <linux/lguest_launcher.h>
 #include <linux/virtio_console.h>
+#include <linux/pm.h>
 #include <asm/paravirt.h>
 #include <asm/param.h>
 #include <asm/page.h>