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/mcf547x_8x/slicetimer.c b/arch/m68k/cpu/mcf547x_8x/slicetimer.c
index c4988f9..33b4cff 100644
--- a/arch/m68k/cpu/mcf547x_8x/slicetimer.c
+++ b/arch/m68k/cpu/mcf547x_8x/slicetimer.c
@@ -7,6 +7,7 @@
 #include <common.h>
 #include <init.h>
 #include <irq_func.h>
+#include <linux/delay.h>
 
 #include <asm/timer.h>
 #include <asm/immap.h>