set the default device to interact with
usage: fx set-device [<device-name>] fx set-device is used to specify the default device to target for various fx commands, such as serve, syslog, and so on. A device is set within the scope of a build directory (i.e. out/arm64 may have a different pair set than out/x64). If no device name is given, set-device will attempt to discover devices. If one device is found, that device is set as the default for the current build directory. If more than one device is found, the user must select one and provide it to a subsequent invocation of the command. To unset, use `fx unset-device`.