[POWERPC][XEN] Fix build by adding proper guards to asm/numa.h

Signed-off-by: Hollis Blanchard <hollisb@us.ibm.com>

xen/include/asm-powerpc/numa.h

@@ -1,3 +1,28 @@
+/*
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301, USA.
+ *
+ * Copyright (C) IBM Corp. 2007
+ *
+ * Authors: Hollis Blanchard <hollisb@us.ibm.com>
+ */
+
+#ifndef __ASM_NUMA_H__
+#define __ASM_NUMA_H__
+
 #include <xen/init.h>
 #include "../asm-x86/numa.h"
 extern void numa_initmem_init(unsigned long start_pfn, unsigned long end_pfn);
+
+#endif