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-mvebu/cpu.c b/arch/arm/mach-mvebu/cpu.c
index ab8b029..c56b0ae 100644
--- a/arch/arm/mach-mvebu/cpu.c
+++ b/arch/arm/mach-mvebu/cpu.c
@@ -7,6 +7,7 @@
 #include <ahci.h>
 #include <cpu_func.h>
 #include <init.h>
+#include <linux/delay.h>
 #include <linux/mbus.h>
 #include <asm/io.h>
 #include <asm/pl310.h>