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-tegra/cpu.c b/arch/arm/mach-tegra/cpu.c
index d12ebb3..65b15b7 100644
--- a/arch/arm/mach-tegra/cpu.c
+++ b/arch/arm/mach-tegra/cpu.c
@@ -13,6 +13,7 @@
 #include <asm/arch-tegra/clk_rst.h>
 #include <asm/arch-tegra/pmc.h>
 #include <asm/arch-tegra/scu.h>
+#include <linux/delay.h>
 #include "cpu.h"
 
 int get_num_cpus(void)