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/arch/m68k/cpu/mcf532x/cpu.c b/arch/m68k/cpu/mcf532x/cpu.c
index 87b77f4..72bfdf0 100644
--- a/arch/m68k/cpu/mcf532x/cpu.c
+++ b/arch/m68k/cpu/mcf532x/cpu.c
@@ -15,6 +15,7 @@
 #include <watchdog.h>
 #include <command.h>
 #include <netdev.h>
+#include <linux/delay.h>
 
 #include <asm/immap.h>
 #include <asm/io.h>