arm64: dts: renesas: r8a77970: sort includes

Sort includes used in r8a77970 DTS to improve maintainability
and for consistency with other R-Car DTS files.
Signed-off-by: Simon Horman <horms+renesas@verge.net.au>
Reviewed-by: Geert Uytterhoeven <geert+renesas@glider.be>

arch/arm64/boot/dts/renesas/r8a77970.dtsi

@@ -9,9 +9,9 @@
  * kind, whether express or implied.
  */
 
-#include <dt-bindings/interrupt-controller/irq.h>
-#include <dt-bindings/interrupt-controller/arm-gic.h>
 #include <dt-bindings/clock/renesas-cpg-mssr.h>
+#include <dt-bindings/interrupt-controller/arm-gic.h>
+#include <dt-bindings/interrupt-controller/irq.h>
 
 / {
 	compatible = "renesas,r8a77970";