[][kernel][mt7988][cpu][Fix syntax error for the PMU node]

[Description]
Fix syntax error for the PMU node.

If without this patch, perf might report "cycles: PMU Hardware doesn't
support sampling/overflow-interrupts." error on the "perf record" and
"perf top" commands.

[Release-log]
N/A


Change-Id: I15392443f6f58029d569253592261e0514f51c42
Reviewed-on: https://gerrit.mediatek.inc/c/openwrt/feeds/mtk_openwrt_feeds/+/7399732
diff --git a/target/linux/mediatek/files-5.4/arch/arm64/boot/dts/mediatek/mt7988.dtsi b/target/linux/mediatek/files-5.4/arch/arm64/boot/dts/mediatek/mt7988.dtsi
index 364deef..bae7604 100644
--- a/target/linux/mediatek/files-5.4/arch/arm64/boot/dts/mediatek/mt7988.dtsi
+++ b/target/linux/mediatek/files-5.4/arch/arm64/boot/dts/mediatek/mt7988.dtsi
@@ -115,7 +115,7 @@
 	pmu {
 		compatible = "arm,cortex-a73-pmu";
 		interrupt-parent = <&gic>;
-		interrupt = <GIC_PPI 7 IRQ_TYPE_LEVEL_LOW>;
+		interrupts = <GIC_PPI 7 IRQ_TYPE_LEVEL_LOW>;
 	};
 
 	thermal-zones {