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/kmp204x/pci.c b/board/keymile/kmp204x/pci.c
index 15bbc81..87bf168 100644
--- a/board/keymile/kmp204x/pci.c
+++ b/board/keymile/kmp204x/pci.c
@@ -11,6 +11,7 @@
 #include <init.h>
 #include <pci.h>
 #include <asm/fsl_pci.h>
+#include <linux/delay.h>
 #include <linux/libfdt.h>
 #include <fdt_support.h>
 #include <asm/fsl_serdes.h>