ARM: dts: sync Amlogic ARM64 DT from v6.2-rc1

This syncs the Amlogic G12A, G12B & SM1 base DT + the
Odroid Go Ultra DT from Linux v6.2-rc1 from commmit [1].

[1] 1b929c02afd3 ("Linux 6.2-rc1")

Link: https://lore.kernel.org/r/20230119-u-boot-odroid-go-ultra-v1-1-f96bab9db396@linaro.org
Signed-off-by: Neil Armstrong <neil.armstrong@linaro.org>
diff --git a/arch/arm/dts/meson-g12b.dtsi b/arch/arm/dts/meson-g12b.dtsi
index ee8fcae..75ff00f 100644
--- a/arch/arm/dts/meson-g12b.dtsi
+++ b/arch/arm/dts/meson-g12b.dtsi
@@ -105,6 +105,7 @@
 
 		l2: l2-cache0 {
 			compatible = "cache";
+			cache-level = <2>;
 		};
 	};
 };
@@ -139,3 +140,7 @@
 &mali {
 	dma-coherent;
 };
+
+&pmu {
+	compatible = "amlogic,g12b-ddr-pmu";
+};