ARM: dts: sun5i: Add interrupt for display backend

The display backend on sun5i shares the same interrupt line as the
display frontend. Add it.
Signed-off-by: Chen-Yu Tsai <wens@csie.org>
Signed-off-by: Maxime Ripard <maxime.ripard@free-electrons.com>

arch/arm/boot/dts/sun5i.dtsi

@@ -689,6 +689,7 @@ fe0_out_be0: endpoint@0 {
 		be0: display-backend@01e60000 {
 			compatible = "allwinner,sun5i-a13-display-backend";
 			reg = <0x01e60000 0x10000>;
+			interrupts = <47>;
 			clocks = <&ccu CLK_AHB_DE_BE>, <&ccu CLK_DE_BE>,
 				 <&ccu CLK_DRAM_DE_BE>;
 			clock-names = "ahb", "mod",