Basic support for Intelbras TIP200 and TIP300 phones

Intelbras TIP200 and TIP300 are a rebranded version of Yealink's phones. This is basically a copy-paste of yealinks t3x model, with minor changes such as name, OUI, etc.

I've tested it with TIP200 phones, and basic configuration is working fine. I'll test more on the next few days, and update this pull request as needed.