arm64: dts: imx8mq-librem5: Remove invalid charger properties

Per bq25890.yaml, 'phys', 'ti,use-vinmin-threshold', 'ti,vinmin-threshold'
are not valid properties.

Remove them to fix the following schema warning:

imx8mq-librem5-r2.dtb: charger@6a: Unevaluated properties are not allowed ('phys', 'ti,use-vinmin-threshold', 'ti,vinmin-threshold' were unexpected)
	from schema $id: http://devicetree.org/schemas/power/supply/bq25890.yaml#Signed-off-by: Fabio Estevam <festevam@denx.de>
Signed-off-by: Shawn Guo <shawnguo@kernel.org>

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

@@ -1154,15 +1154,12 @@ bq25895: charger@6a {
 		pinctrl-0 = <&pinctrl_charger_in>;
 		interrupt-parent = <&gpio3>;
 		interrupts = <3 IRQ_TYPE_EDGE_FALLING>;
-		phys = <&usb3_phy0>;
 		ti,battery-regulation-voltage = <4208000>; /* uV */
 		ti,termination-current = <128000>;  /* uA */
 		ti,precharge-current = <128000>; /* uA */
 		ti,minimum-sys-voltage = <3700000>; /* uV */
 		ti,boost-voltage = <5000000>; /* uV */
 		ti,boost-max-current = <1500000>; /* uA */
-		ti,use-vinmin-threshold = <1>; /* enable VINDPM */
-		ti,vinmin-threshold = <3900000>; /* uV */
 		monitored-battery = <&bat>;
 		power-supplies = <&typec_pd>;
 	};