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-common.c b/arch/powerpc/kernel/setup-common.c
index 26bb1fe..17c46a2 100644
--- a/arch/powerpc/kernel/setup-common.c
+++ b/arch/powerpc/kernel/setup-common.c
@@ -53,6 +53,8 @@
 #include <asm/lmb.h>
 #include <asm/xmon.h>
 
+#include "setup.h"
+
 #undef DEBUG
 
 #ifdef DEBUG