ARM: dts: sun7i: Change 32768 Hz oscillator node name to clk@N style

Device tree naming conventions state that node names should match
the nodes function. Change external low speed oscillator node name
to match.
Signed-off-by: Chen-Yu Tsai <wens@csie.org>
Signed-off-by: Maxime Ripard <maxime.ripard@free-electrons.com>

arch/arm/boot/dts/sun7i-a20.dtsi

@@ -53,10 +53,11 @@ osc24M: osc24M@01c20050 {
 			clock-frequency = <24000000>;
 		};
 
-		osc32k: osc32k {
+		osc32k: clk@0 {
 			#clock-cells = <0>;
 			compatible = "fixed-clock";
 			clock-frequency = <32768>;
+			clock-output-names = "osc32k";
 		};
 
 		pll1: pll1@01c20000 {