MIPS: DTS: jz4740: Correct interrupt number of DMA core

The interrupt number set in the devicetree node of the DMA driver was
wrong.
Signed-off-by: Paul Cercueil <paul@crapouillou.net>
Signed-off-by: Paul Burton <paul.burton@mips.com>
Cc: Rob Herring <robh+dt@kernel.org>
Cc: Mark Rutland <mark.rutland@arm.com>
Cc: Ralf Baechle <ralf@linux-mips.org>
Cc: James Hogan <jhogan@kernel.org>
Cc: devicetree@vger.kernel.org
Cc: linux-mips@vger.kernel.org
Cc: linux-kernel@vger.kernel.org

arch/mips/boot/dts/ingenic/jz4740.dtsi

@@ -161,7 +161,7 @@ dmac: dma-controller@13020000 {
 		#dma-cells = <2>;
 
 		interrupt-parent = <&intc>;
-		interrupts = <29>;
+		interrupts = <20>;
 
 		clocks = <&cgu JZ4740_CLK_DMA>;