Add AU915-928 dwell time variant in FSB 1

[EduardoPfeifer]

Summary

By default, the Frequency Plan Australia 915 - 928MHz has a Dwell Time enabled, causing Uplink with large Payload cannot be sent.

Why do we need this?

Since Brazil does not have Dwell Time limitation, we need to have a Frequency Plan where Dwell Time is disabled by default.

How do you propose to implement this?

Yes

Can you do this yourself and submit a Pull Request?

Yes