dts: arm: rpi_pico: remove default startup-delay-multiplier from .dtsi

The default is defined in dts/bindings/clock/raspberrypi,pico-xosc.yaml.

Signed-off-by: Xudong Zheng <[email protected]>

Author: xudongzheng

dts/arm/raspberrypi/rpi_pico/rp2040.dtsi

@@ -168,7 +168,6 @@
 		xosc: xosc {
 			compatible = "raspberrypi,pico-xosc";
 			clock-frequency = <12000000>;
-			startup-delay-multiplier = <64>;
 			#clock-cells = <0>;
 		};