arm64: dts: mediatek: mt6795: Specify interrupts for vGIC

Add the maintenance interrupt for GIC-400.
Signed-off-by: AngeloGioacchino Del Regno <angelogioacchino.delregno@collabora.com>
Link: https://lore.kernel.org/r/20220609112303.117928-11-angelogioacchino.delregno@collabora.comSigned-off-by: Matthias Brugger <matthias.bgg@gmail.com>

arch/arm64/boot/dts/mediatek/mt6795.dtsi

@@ -246,6 +246,8 @@ gic: interrupt-controller@10221000 {
 			      <0 0x10222000 0 0x2000>,
 			      <0 0x10224000 0 0x2000>,
 			      <0 0x10226000 0 0x2000>;
+			interrupts = <GIC_PPI 9
+				(GIC_CPU_MASK_SIMPLE(4) | IRQ_TYPE_LEVEL_HIGH)>;
 		};
 
 		cci: cci@10390000 {