Add mpu9250 demo program

[gsexton]

Update go.mod and go.sum to new devices branch.

[codecov]

Codecov Report

Attention: Patch coverage is 0% with 19 lines in your changes missing coverage. Please review.

Project coverage is 0.0%. Comparing base (4305ecf) to head (2cb6c01).
Report is 1 commits behind head on main.

Files with missing lines	Patch %	Lines
mpu9250/main.go	0.0%	19 Missing ⚠️

❌ Your patch status has failed because the patch coverage (0.0%) is below the target coverage (60.0%). You can increase the patch coverage or adjust the target coverage.
❌ Your project status has failed because the head coverage (0.0%) is below the target coverage (60.0%). You can increase the head coverage or adjust the target coverage.

Additional details and impacted files

@@         Coverage Diff         @@
##           main    #11   +/-   ##
===================================
  Coverage   0.0%   0.0%           
===================================
  Files        52     52           
  Lines      4534   4541    +7     
===================================
- Misses     4534   4541    +7     

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