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/keymile/km83xx/km83xx.c b/board/keymile/km83xx/km83xx.c
index 3c869b7..29514d8 100644
--- a/board/keymile/km83xx/km83xx.c
+++ b/board/keymile/km83xx/km83xx.c
@@ -26,6 +26,7 @@
 #include <asm/mmu.h>
 #include <asm/processor.h>
 #include <pci.h>
+#include <linux/delay.h>
 #include <linux/libfdt.h>
 #include <post.h>
 
diff --git a/board/keymile/km83xx/km83xx_i2c.c b/board/keymile/km83xx/km83xx_i2c.c
index 113ca70..62100b1 100644
--- a/board/keymile/km83xx/km83xx_i2c.c
+++ b/board/keymile/km83xx/km83xx_i2c.c
@@ -8,6 +8,7 @@
 #include <i2c.h>
 #include <asm/io.h>
 #include <linux/ctype.h>
+#include <linux/delay.h>
 #include "../common/common.h"
 
 static void i2c_write_start_seq(void)