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

USB type-c feeds the bq25896 charge controller on the Librem 5 Devkit.
2 jobs for bq_supply_devkit in 94 minutes and 27 seconds (queued for 2 seconds)
Status Name Job ID Coverage
  Build
passed build:aarch64 #370575
librem5

00:38:47

passed build:deb #370576
librem5:arm64

01:34:26