Delete mmdet.ops

[hhaAndroid]

delete mmdet.ops because it has been moved to mmcv

[ZwwWayne]

The directory of mmdet.ops should also be deleted.

[codecov]

Codecov Report

Merging #4325 (08043b7) into master (0c84b65) will decrease coverage by 0.05%.
The diff coverage is n/a.

@@            Coverage Diff             @@
##           master    #4325      +/-   ##
==========================================
- Coverage   61.88%   61.82%   -0.06%     
==========================================
  Files         240      239       -1     
  Lines       18267    18265       -2     
  Branches     3058     3058              
==========================================
- Hits        11304    11292      -12     
- Misses       6416     6425       +9     
- Partials      547      548       +1     

Flag	Coverage Δ
unittests	61.79% <ø> (-0.06%)	⬇️

Flags with carried forward coverage won't be shown. Click here to find out more.

Impacted Files	Coverage Δ
mmdet/models/roi_heads/mask_scoring_roi_head.py	55.35% <0.00%> (-32.15%)	⬇️
mmdet/models/roi_heads/mask_heads/maskiou_head.py	94.62% <0.00%> (-5.38%)	⬇️
mmdet/models/roi_heads/test_mixins.py	54.26% <0.00%> (+8.52%)	⬆️

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