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/ti/am335x/board.c b/board/ti/am335x/board.c
index 56fe171..474495a 100644
--- a/board/ti/am335x/board.c
+++ b/board/ti/am335x/board.c
@@ -36,6 +36,7 @@
 #include <i2c.h>
 #include <miiphy.h>
 #include <cpsw.h>
+#include <linux/delay.h>
 #include <power/tps65217.h>
 #include <power/tps65910.h>
 #include <env_internal.h>
diff --git a/board/ti/evm/evm.c b/board/ti/evm/evm.c
index d6d21ba..aba74fc 100644
--- a/board/ti/evm/evm.c
+++ b/board/ti/evm/evm.c
@@ -28,6 +28,7 @@
 #include <twl4030.h>
 #include <asm/mach-types.h>
 #include <asm/omap_musb.h>
+#include <linux/delay.h>
 #include <linux/mtd/rawnand.h>
 #include <linux/usb/ch9.h>
 #include <linux/usb/gadget.h>
diff --git a/board/ti/ks2_evm/board_k2g.c b/board/ti/ks2_evm/board_k2g.c
index 21f002e..450ccc4 100644
--- a/board/ti/ks2_evm/board_k2g.c
+++ b/board/ti/ks2_evm/board_k2g.c
@@ -18,6 +18,7 @@
 #include <fdtdec.h>
 #include <i2c.h>
 #include <remoteproc.h>
+#include <linux/delay.h>
 #include "mux-k2g.h"
 #include "../common/board_detect.h"
 
diff --git a/board/ti/omap5_uevm/evm.c b/board/ti/omap5_uevm/evm.c
index fab48a7..e35f319 100644
--- a/board/ti/omap5_uevm/evm.c
+++ b/board/ti/omap5_uevm/evm.c
@@ -14,6 +14,7 @@
 #include <asm/arch/mmc_host_def.h>
 #include <tca642x.h>
 #include <usb.h>
+#include <linux/delay.h>
 #include <linux/usb/gadget.h>
 #include <dwc3-uboot.h>
 #include <dwc3-omap-uboot.h>