zephyr is transition away from devicetree label property for nodes
that are associated with devices. So remove it from
"zephyr,cdc-acm-uart" nodes.
Signed-off-by: Kumar Gala <galak@kernel.org>
Move CDC ACM UART node from common DTC overlay to
specific overlays, nrf52840_big.overlays and
usb_cdc_acm.overlays.
Signed-off-by: Johann Fischer <johann.fischer@nordicsemi.no>