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/arm/mach-orion5x/timer.c b/arch/arm/mach-orion5x/timer.c
index a64d572..4926bb7 100644
--- a/arch/arm/mach-orion5x/timer.c
+++ b/arch/arm/mach-orion5x/timer.c
@@ -11,6 +11,7 @@
 #include <init.h>
 #include <time.h>
 #include <asm/io.h>
+#include <linux/delay.h>
 
 #define UBOOT_CNTR	0	/* counter to use for uboot timer */