powerpc: Get 64-bit configs to compile with ARCH=powerpc

This is a bunch of mostly small fixes that are needed to get
ARCH=powerpc to compile for 64-bit.  This adds setup_64.c from
arch/ppc64/kernel/setup.c and locks.c from arch/ppc64/lib/locks.c.

Signed-off-by: Paul Mackerras <paulus@samba.org>
diff --git a/include/asm-powerpc/hardirq.h b/include/asm-powerpc/hardirq.h
index 2c0a31b..3b3e3b4 100644
--- a/include/asm-powerpc/hardirq.h
+++ b/include/asm-powerpc/hardirq.h
@@ -1,6 +1,9 @@
 #ifndef _ASM_POWERPC_HARDIRQ_H
 #define _ASM_POWERPC_HARDIRQ_H
 
+#include <asm/irq.h>
+#include <asm/bug.h>
+
 /* The __last_jiffy_stamp field is needed to ensure that no decrementer
  * interrupt is lost on SMP machines. Since on most CPUs it is in the same
  * cache line as local_irq_count, it is cheap to access and is also used on UP