common: Drop linux/delay.h from common header

Move this uncommon header out of the common header.

Signed-off-by: Simon Glass <sjg@chromium.org>
diff --git a/arch/arm/cpu/armv7/sunxi/timer.c b/arch/arm/cpu/armv7/sunxi/timer.c
index 4f6a66d..65b64b5 100644
--- a/arch/arm/cpu/armv7/sunxi/timer.c
+++ b/arch/arm/cpu/armv7/sunxi/timer.c
@@ -10,6 +10,7 @@
 #include <time.h>
 #include <asm/io.h>
 #include <asm/arch/timer.h>
+#include <linux/delay.h>
 
 DECLARE_GLOBAL_DATA_PTR;