IMU: Add ICM42686P IMU support

[bkleiner]

Port of betaflight/betaflight#14941, in our testing it seems to perform very similar to the ICM42688P

[github-actions]

Test firmware build ready — commit 7346864

Download firmware for PR #11639

238 targets built. Find your board's .hex file by name on that page (e.g. MATEKF405SE.hex). Files are individually downloadable — no GitHub login required.

Development build for testing only. Use Full Chip Erase when flashing.

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[sensei-hacker]

in our testing it seems to perform very similar to the ICM42688P

Just checking - tested with this commit exactly?

[bkleiner]

in our testing it seems to perform very similar to the ICM42688P

Just checking - tested with this commit exactly?

Initially with quads on the betaflight commit linked, now also with inav in this little guy:

I would like to verify once again that it doesn’t mess up any of the other two gyros, but it think it should be good to go.

[bkleiner]

As expected ICM42688P continues to work as intended.