arm64: dts: imx8mq-librem5: Add usb-c chip as supplier for the charger

The tps65982 feeds the bq25895 charge controller on the Librem 5.

Signed-off-by: Guido Günther <agx@sigxcpu.org>
Signed-off-by: Martin Kepplinger <martin.kepplinger@puri.sm>
Signed-off-by: Shawn Guo <shawnguo@kernel.org>