ARM: dts: sun8i: r40: Add clock accuracy for external oscillators

The R40 datasheet specifies a tolerance range for the external
oscillators used. Add them to the device tree as the clock accuracy.
Acked-by: Maxime Ripard <maxime.ripard@bootlin.com>
Tested-by: Corentin Labbe <clabbe.montjoie@gmail.com>
Signed-off-by: Chen-Yu Tsai <wens@csie.org>

arch/arm/boot/dts/sun8i-r40.dtsi

@@ -61,6 +61,7 @@ osc24M: osc24M {
 			#clock-cells = <0>;
 			compatible = "fixed-clock";
 			clock-frequency = <24000000>;
+			clock-accuracy = <50000>;
 			clock-output-names = "osc24M";
 		};
 
@@ -68,6 +69,7 @@ osc32k: osc32k {
 			#clock-cells = <0>;
 			compatible = "fixed-clock";
 			clock-frequency = <32768>;
+			clock-accuracy = <20000>;
 			clock-output-names = "osc32k";
 		};
 	};