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/s35392a.c b/drivers/rtc/s35392a.c
index 3bfe481..80f55c8 100644
--- a/drivers/rtc/s35392a.c
+++ b/drivers/rtc/s35392a.c
@@ -23,6 +23,7 @@
 #include <i2c.h>
 #include <linux/bitrev.h>
 #include <rtc.h>
+#include <linux/delay.h>
 
 #define S35390A_CHIP_ADDR	0x30