arm: Include asm/setup.h explictly

Include this header where needed so we do not need to rely on common.h.

Signed-off-by: Simon Glass <sjg@chromium.org>
diff --git a/board/bluegiga/apx4devkit/apx4devkit.c b/board/bluegiga/apx4devkit/apx4devkit.c
index 08e79bd..2215c29 100644
--- a/board/bluegiga/apx4devkit/apx4devkit.c
+++ b/board/bluegiga/apx4devkit/apx4devkit.c
@@ -17,6 +17,7 @@
 #include <common.h>
 #include <asm/gpio.h>
 #include <asm/io.h>
+#include <asm/setup.h>
 #include <asm/arch/imx-regs.h>
 #include <asm/arch/iomux-mx28.h>
 #include <asm/arch/clock.h>