arm64: dts: rockchip: remove static xin32k from px30

Similar to all other Rockchip SoCs the px30 does not have a static
32kHz clock. Instead it again gets supplied from an external component
like the pmic.

So drop the static clock, so that we can hook up the right one.
Signed-off-by: Heiko Stuebner <heiko@sntech.de>
Link: https://lore.kernel.org/r/20190917082659.25549-2-heiko@sntech.de

arch/arm64/boot/dts/rockchip/px30.dtsi

@@ -195,13 +195,6 @@ xin24m: xin24m {
 		clock-output-names = "xin24m";
 	};
 
-	xin32k: xin32k {
-		compatible = "fixed-clock";
-		#clock-cells = <0>;
-		clock-frequency = <32768>;
-		clock-output-names = "xin32k";
-	};
-
 	pmu: power-management@ff000000 {
 		compatible = "rockchip,px30-pmu", "syscon", "simple-mfd";
 		reg = <0x0 0xff000000 0x0 0x1000>;