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/ds1302.c b/drivers/rtc/ds1302.c
index b94163f..189607c 100644
--- a/drivers/rtc/ds1302.c
+++ b/drivers/rtc/ds1302.c
@@ -8,6 +8,7 @@
 #include <common.h>
 #include <command.h>
 #include <rtc.h>
+#include <linux/delay.h>
 
 /* GPP Pins */
 #define DATA		0x200