Address fields in ugmt_constants will be modified

[dinyar]

Due to dinyar/uGMTfirmware#263 the ADDRESS_IN_LOW and ADDRESS_IN_HIGH fields are going to be replaced with subsystem-specific entries. Will this break things? In that case I can leave this in as an unused constant.

[jlingema]

That won't break anything as we're not filling that info, I think.. In any case the software should also use the new fields that are more explicit, as soon as they are added.