ARM: dts: meson8b: add the internal clock measurer

The Amlogic Meson8b SoC has an internal clock measurer IP which allows
measuring frequencies of various clock paths.
Enable it on meson8b.dtsi so we can use it.
Signed-off-by: Martin Blumenstingl <martin.blumenstingl@googlemail.com>
Signed-off-by: Kevin Hilman <khilman@baylibre.com>

arch/arm/boot/dts/meson8b.dtsi

@@ -294,6 +294,11 @@ pwm_ef: pwm@86c0 {
 		status = "disabled";
 	};
 
+	clock-measure@8758 {
+		compatible = "amlogic,meson8b-clk-measure";
+		reg = <0x8758 0x1c>;
+	};
+
 	pinctrl_cbus: pinctrl@9880 {
 		compatible = "amlogic,meson8b-cbus-pinctrl";
 		reg = <0x9880 0x10>;