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/freescale/mpc837xerdb/mpc837xerdb.c b/board/freescale/mpc837xerdb/mpc837xerdb.c
index 45038ac..3fd2c5e 100644
--- a/board/freescale/mpc837xerdb/mpc837xerdb.c
+++ b/board/freescale/mpc837xerdb/mpc837xerdb.c
@@ -16,6 +16,7 @@
 #include <spd_sdram.h>
 #include <vsc7385.h>
 #include <fsl_esdhc.h>
+#include <linux/delay.h>
 
 DECLARE_GLOBAL_DATA_PTR;
 
diff --git a/board/freescale/mpc837xerdb/pci.c b/board/freescale/mpc837xerdb/pci.c
index 07471e0..dccf8c5 100644
--- a/board/freescale/mpc837xerdb/pci.c
+++ b/board/freescale/mpc837xerdb/pci.c
@@ -8,6 +8,7 @@
 #include <mpc83xx.h>
 #include <pci.h>
 #include <asm/io.h>
+#include <linux/delay.h>
 
 static struct pci_region pci_regions[] = {
 	{