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/board/bluewater/gurnard/gurnard.c b/board/bluewater/gurnard/gurnard.c
index 4ae70e1..2bbb203 100644
--- a/board/bluewater/gurnard/gurnard.c
+++ b/board/bluewater/gurnard/gurnard.c
@@ -33,6 +33,7 @@
 #include <asm/arch/clk.h>
 #include <asm/arch/gpio.h>
 #include <dm/uclass-internal.h>
+#include <linux/delay.h>
 
 #ifdef CONFIG_GURNARD_SPLASH
 #include "splash_logo.h"
diff --git a/board/bluewater/snapper9260/snapper9260.c b/board/bluewater/snapper9260/snapper9260.c
index 47ce307..8e2b7e0 100644
--- a/board/bluewater/snapper9260/snapper9260.c
+++ b/board/bluewater/snapper9260/snapper9260.c
@@ -23,6 +23,7 @@
 #include <netdev.h>
 #include <i2c.h>
 #include <pca953x.h>
+#include <linux/delay.h>
 
 DECLARE_GLOBAL_DATA_PTR;