arm64: dts: imx8mq-librem5-devkit: Drop buck3 startup-ramp-delay

The PMIC driver now sets appropriate default delays.
Signed-off-by: NGuido Günther <agx@sigxcpu.org>
Signed-off-by: NMartin Kepplinger <martin.kepplinger@puri.sm>
Signed-off-by: NShawn Guo <shawnguo@kernel.org>

arch/arm64/boot/dts/freescale/imx8mq-librem5-devkit.dts

@@ -315,7 +315,6 @@
 				regulator-min-microvolt = <700000>;
 				regulator-max-microvolt = <1300000>;
 				regulator-boot-on;
-				regulator-enable-ramp-delay = <200>;
 				rohm,dvs-run-voltage = <900000>;
 			};