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/Marvell/gplugd/gplugd.c b/board/Marvell/gplugd/gplugd.c
index 459b7ba..1e2f227 100644
--- a/board/Marvell/gplugd/gplugd.c
+++ b/board/Marvell/gplugd/gplugd.c
@@ -21,6 +21,7 @@
 #include <asm/gpio.h>
 #include <miiphy.h>
 #include <asm/mach-types.h>
+#include <linux/delay.h>
 
 #ifdef CONFIG_ARMADA100_FEC
 #include <net.h>
diff --git a/board/Marvell/mvebu_armada-37xx/board.c b/board/Marvell/mvebu_armada-37xx/board.c
index 29bd6a9..9bea198 100644
--- a/board/Marvell/mvebu_armada-37xx/board.c
+++ b/board/Marvell/mvebu_armada-37xx/board.c
@@ -11,6 +11,7 @@
 #include <asm/io.h>
 #include <asm/arch/cpu.h>
 #include <asm/arch/soc.h>
+#include <linux/delay.h>
 
 DECLARE_GLOBAL_DATA_PTR;
 
diff --git a/board/Marvell/mvebu_armada-8k/board.c b/board/Marvell/mvebu_armada-8k/board.c
index 499e893..60b0024 100644
--- a/board/Marvell/mvebu_armada-8k/board.c
+++ b/board/Marvell/mvebu_armada-8k/board.c
@@ -10,6 +10,7 @@
 #include <asm/io.h>
 #include <asm/arch/cpu.h>
 #include <asm/arch/soc.h>
+#include <linux/delay.h>
 
 DECLARE_GLOBAL_DATA_PTR;