MIPS: xilfpga: Update DT node and specify uart irq

Update the DT node with the UART irq
Signed-off-by: Zubair Lutfullah Kakakhel <Zubair.Kakakhel@imgtec.com>
Cc: linux-mips@linux-mips.org
Cc: linux-kernel@vger.kernel.org
Patchwork: https://patchwork.linux-mips.org/patch/14593/Signed-off-by: Ralf Baechle <ralf@linux-mips.org>

arch/mips/boot/dts/xilfpga/nexys4ddr.dts

@@ -50,6 +50,9 @@ axi_uart16550: serial@10400000 {
 		reg-offset = <0x1000>;
 
 		clocks	= <&ext>;
+
+		interrupt-parent = <&axi_intc>;
+		interrupts = <0>;
 	};
 };