boards: shields: rpi_pico_uno_flexypin: Fix conflicting connector node

The `/connector` node conflicts with
`boards/raspberrypi/rpi_pico/rpi_pico-common.dtsi` definition.

Renaming it to `connector_arduino` to avoid conflict with that.

Signed-off-by: TOKITA Hiroshi <tokita.hiroshi@gmail.com>
1 file changed