Angle: add support for MT6816, MT6826S sensors

[nefelim4ag]

For now, this is just a proposal - till there are other real users.

MT6816 - simple 14-bit angle sensor, can be read and that's it.
MT6826S - Has calibration capabilities - implemented, hysteresis, and 15-bit output
MT6835 - (21 bit) should work with code from MT6826S, we anyway will ignore additional bits.

For now, I mostly play around with MT6826S.

Thanks.

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BTW, it would be nice to have a generic query command for the angle sensor, like ACCELEROMETER_QUERY.

[KevinOConnor]

Thanks. As very high-level feedback, we can certainly add support for these additional sensors. The code would need to pass the regression tests though.

Cheers,
-Kevin

[nefelim4ag]

But for now it is failing because of image limitations:

...  ../../or1k-linux-musl/bin/ld: Klipper image is too large

The only idea that I have is to disable angle sensors for ar100.