ARM: imx53: include IRQ dt-bindings header

Allows to use the more meaningful IRQ flag defines instead of
the raw values.

Signed-off-by: Lucas Stach <[e-mail]>
Signed-off-by: Shawn Guo <[e-mail]>

arch/arm/boot/dts/imx53.dtsi

···
 #include <dt-bindings/clock/imx5-clock.h>
 #include <dt-bindings/gpio/gpio.h>
 #include <dt-bindings/input/input.h>
+#include <dt-bindings/interrupt-controller/irq.h>
 
 / {
 	aliases {