v3.1.0: Added Model 4916 & Model 4917 boards support

What's Changed

• add support to Model 4917 by @dhineshkumarmcci in #197
• fix #198: add support to Model 4916 by @dhineshkumarmcci in #200
• fix #199: Enable two HW serial support for 4630 by @dhineshkumarmcci in #203
• fix#204: This is v3.1.0 by @dhineshkumarmcci in #205

Full Changelog: v3.0.5...v3.1.0