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-imx/misc.c b/arch/arm/mach-imx/misc.c
index 549ef2b..818f38e 100644
--- a/arch/arm/mach-imx/misc.c
+++ b/arch/arm/mach-imx/misc.c
@@ -7,6 +7,7 @@
 #include <lmb.h>
 #include <log.h>
 #include <asm/arch/sys_proto.h>
+#include <linux/delay.h>
 #include <linux/errno.h>
 #include <asm/io.h>
 #include <asm/mach-imx/regs-common.h>