x86, lguest: fix apic_ops build on UP

fix:

  arch/x86/lguest/boot.c:816: error: variable ‘lguest_basic_apic_ops’ has initializer but incomplete type
  arch/x86/lguest/boot.c:817: error: unknown field ‘read’ specified in initializer
 [...]
Signed-off-by: NIngo Molnar <mingo@elte.hu>

arch/x86/lguest/boot.c

@@ -55,6 +55,7 @@
 #include <linux/lguest_launcher.h>
 #include <linux/virtio_console.h>
 #include <linux/pm.h>
+#include <asm/apic.h>
 #include <asm/lguest.h>
 #include <asm/paravirt.h>
 #include <asm/param.h>