ARM: tegra: colibri_t20: get rid of fake clocks simple bus

Get rid of the fake clocks simple bus and use node names as per the
actual schematics.
Signed-off-by: Marcel Ziswiler <marcel.ziswiler@toradex.com>
Signed-off-by: Thierry Reding <treding@nvidia.com>

arch/arm/boot/dts/tegra20-colibri.dtsi

@@ -701,17 +701,10 @@ usb-phy@c5004000 {
 		vbus-supply = <&reg_lan_v_bus>;
 	};
 
-	clocks {
-		compatible = "simple-bus";
-		#address-cells = <1>;
-		#size-cells = <0>;
-
-		clk32k_in: clock@0 {
-			compatible = "fixed-clock";
-			reg = <0>;
-			#clock-cells = <0>;
-			clock-frequency = <32768>;
-		};
+	clk32k_in: xtal3 {
+		compatible = "fixed-clock";
+		#clock-cells = <0>;
+		clock-frequency = <32768>;
 	};
 
 	reg_lan_v_bus: regulator-lan-v-bus {