With upcoming ICs that are not in the nRF5x family, rename the flash
driver and all its dependencies from nrf5 to nrf.
Should also fix the issue introduced by f49150cab6 which broke the
assignment of the flash device due to a partial rename.
Signed-off-by: Carles Cufi <carles.cufi@nordicsemi.no>
Add samples config for nRF52840 with OpenThread
for echo_client and echo_server.
Add OpenThread to CI for echo_client and echo_server on nRF52840
Signed-off-by: Kamil Sroka <kamil.sroka@nordicsemi.no>