arm64: dts: rockchip: fix vopl iommu irq on px30

The vop-mmu shares the irq with its matched vop but not the vpu.

Fixes: 7053e06b ("arm64: dts: rockchip: add core dtsi file for PX30 SoCs")
Signed-off-by: Sandy Huang <hjc@rock-chips.com>
Signed-off-by: Heiko Stuebner <heiko@sntech.de>
Reviewed-by: Ezequiel Garcia <ezequiel@collabora.com>
Reviewed-by: Paul Kocialkowski <paul.kocialkowski@bootlin.com>
Tested-by: Paul Kocialkowski <paul.kocialkowski@bootlin.com>
Link: https://lore.kernel.org/r/20210108110627.3231226-1-heiko@sntech.de

arch/arm64/boot/dts/rockchip/px30.dtsi

@@ -1097,7 +1097,7 @@ vopl_out_lvds: endpoint@1 {
 	vopl_mmu: iommu@ff470f00 {
 		compatible = "rockchip,iommu";
 		reg = <0x0 0xff470f00 0x0 0x100>;
-		interrupts = <GIC_SPI 79 IRQ_TYPE_LEVEL_HIGH>;
+		interrupts = <GIC_SPI 78 IRQ_TYPE_LEVEL_HIGH>;
 		interrupt-names = "vopl_mmu";
 		clocks = <&cru ACLK_VOPL>, <&cru HCLK_VOPL>;
 		clock-names = "aclk", "iface";