Feature/509 remove avpr

[PengZheng]

This PR performs the planned removal of avpr from libdfi, as mentioned in #509.
It will also close #158.

[codecov-commenter]

Codecov Report

Attention: 1 lines in your changes are missing coverage. Please review.

Comparison is base (8956987) 83.47% compared to head (d2d5974) 84.26%.

❗ Current head d2d5974 differs from pull request most recent head 578869e. Consider uploading reports for the commit 578869e to get more accurate results

Files	Patch %	Lines
...te_service_admin_dfi/src/import_registration_dfi.c	0.00%	1 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##           master     #697      +/-   ##
==========================================
+ Coverage   83.47%   84.26%   +0.78%     
==========================================
  Files         254      248       -6     
  Lines       32988    31124    -1864     
==========================================
- Hits        27538    26226    -1312     
+ Misses       5450     4898     -552     

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[pnoltes]

I got a small remark about a log level, but overall LGTM.