arm64: tegra: Fix compatible string for Tegra132 timer

The TKE (time-keeping engine) found on Tegra132 is not backwards
compatible with the version found on Tegra20, so update the compatible
string list accordingly.
Signed-off-by: NThierry Reding <treding@nvidia.com>

arch/arm64/boot/dts/nvidia/tegra132.dtsi

@@ -210,7 +210,7 @@
 	};
 
 	timer@60005000 {
-		compatible = "nvidia,tegra124-timer", "nvidia,tegra20-timer";
+		compatible = "nvidia,tegra124-timer", "nvidia,tegra30-timer";
 		reg = <0x0 0x60005000 0x0 0x400>;
 		interrupts = <GIC_SPI 0 IRQ_TYPE_LEVEL_HIGH>,
 			     <GIC_SPI 1 IRQ_TYPE_LEVEL_HIGH>,