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/drivers/rtc/davinci.c b/drivers/rtc/davinci.c
index 3514e73..c446e7a 100644
--- a/drivers/rtc/davinci.c
+++ b/drivers/rtc/davinci.c
@@ -9,6 +9,7 @@
 #include <rtc.h>
 #include <asm/io.h>
 #include <asm/davinci_rtc.h>
+#include <linux/delay.h>
 
 int rtc_get(struct rtc_time *tmp)
 {