add touchpad support

[wallamide]

there's a rust driver for the azoteq tps-65 available here. it would be nice for this to get ported to rmk. i will be trying to get this working on my current keyboard build with n!n and a tps43, but i'm making slow progress on my project so i'd like to put this out there for others to try if they'd like.

[HaoboGu]

@wallamide I might have some time in the next few months, I'll look into it. The question is, where can I get a azoteq tps-65 for testing? Touchpad support is a feature that I definitely want

[EzioL]

@wallamide I might have some time in the next few months, I'll look into it. The question is, where can I get a azoteq tps-65 for testing? Touchpad support is a feature that I definitely want

贸泽或者1688找南京赛泰