nRF52 in case of USB CDC required `CONFIG_USB_DEVICE_INITIALIZE_AT_BOOT=n`
Due to incorrect error check in `otPlatUartEnable`.
Signed-off-by: Przemyslaw Bida <przemyslaw.bida@nordicsemi.no>
Move OpenThread's glue code along with the Kconfig files that configure
OpenThread stack itself into module directory.
Update the maintainers file to reflect this change.
Signed-off-by: Robert Lubos <robert.lubos@nordicsemi.no>