powerpc: create kernel/setup.h

for functions defined by setup-common.c and used in setup_xx.c

Signed-off-by: Stephen Rothwell <sfr@canb.auug.org.au>
diff --git a/arch/powerpc/kernel/setup_32.c b/arch/powerpc/kernel/setup_32.c
index 0fbc73f..55f485f 100644
--- a/arch/powerpc/kernel/setup_32.c
+++ b/arch/powerpc/kernel/setup_32.c
@@ -40,6 +40,8 @@
 #include <asm/xmon.h>
 #include <asm/time.h>
 
+#include "setup.h"
+
 #define DBG(fmt...)
 
 #if defined CONFIG_KGDB