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/mach-rmobile/timer.c b/arch/arm/mach-rmobile/timer.c
index f88ccfd..ba06535 100644
--- a/arch/arm/mach-rmobile/timer.c
+++ b/arch/arm/mach-rmobile/timer.c
@@ -11,6 +11,7 @@
 #include <asm/io.h>
 #include <asm/arch-armv7/globaltimer.h>
 #include <asm/arch/rmobile.h>
+#include <linux/delay.h>
 
 static struct globaltimer *global_timer = \
 		(struct globaltimer *)GLOBAL_TIMER_BASE_ADDR;