ARM: shmobile: r8a7791 dtsi: Remove superfluous interrupt-parent

There's already an "interrupt-parent = <&gic>;" at the top, which is
inherited by all child nodes, so the "interrupt-parent" property in
the sound node can be removed.
Signed-off-by: Geert Uytterhoeven <geert+renesas@glider.be>
Acked-by: Magnus Damm <damm+renesas@opensource.se>
Signed-off-by: Simon Horman <horms+renesas@verge.net.au>

arch/arm/boot/dts/r8a7791.dtsi

@@ -1124,7 +1124,6 @@ pciec: pcie@fe000000 {
 	rcar_sound: rcar_sound@0xec500000 {
 		#sound-dai-cells = <1>;
 		compatible =  "renesas,rcar_sound-r8a7791", "renesas,rcar_sound-gen2", "renesas,rcar_sound";
-		interrupt-parent = <&gic>;
 		reg =	<0 0xec500000 0 0x1000>, /* SCU */
 			<0 0xec5a0000 0 0x100>,  /* ADG */
 			<0 0xec540000 0 0x1000>, /* SSIU */