ARM: tegra: remove unnecessary includes of <mach/*.h>

This should make it easier to delete or move <mach/*.h>; something that
is useful for single-zImage.

Signed-off-by: Stephen Warren <swarren@nvidia.com>

arch/arm/mach-tegra/board-dt-tegra20.c

@@ -41,7 +41,6 @@
 #include <asm/setup.h>
 
 #include <mach/iomap.h>
-#include <mach/irqs.h>
 
 #include "board.h"
 #include "clock.h"