[To Do]: Enable disabling Ethernet on all Nucleos

[peteGSX]

Task description

When currently selecting a Nucleo with Ethernet (F429ZI, F439ZI?), Ethernet is enabled by default, and the control is disabled. Allow this to be turned off but leave the default as enabled.

[pmantoine]

Changed code to allow disabling of Nucleo Ethernet, and hence enabling of WiFi. Also updated tool tip to be specific to Nucleos as it defaults to on.