Implement hub name support for EV3,

[dlech]

To allow users to give their EV3 a unique name, we need to implement the hub name feature in the firmware like we do in other hubs.

This involves creating a special section in the firmware that contains the default hub name. Then the script that creates the firmware metadata needs to be updated to include the hub-name-size and hub-name-offset read from the linker script or some other build output.