[Refactor] Use MMCV MODEL_REGISTRY

[xvjiarui]

No description provided.

[codecov]

Codecov Report

Merging #515 (1f301b5) into master (98ef5ac) will increase coverage by 0.04%.
The diff coverage is 100.00%.

@@            Coverage Diff             @@
##           master     #515      +/-   ##
==========================================
+ Coverage   86.56%   86.60%   +0.04%     
==========================================
  Files          99       99              
  Lines        5164     5160       -4     
  Branches      836      834       -2     
==========================================
- Hits         4470     4469       -1     
+ Misses        535      533       -2     
+ Partials      159      158       -1     

Flag	Coverage Δ
unittests	86.60% <100.00%> (+0.04%)	⬆️

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

Impacted Files	Coverage Δ
mmseg/models/builder.py	91.30% <100.00%> (+9.82%)	⬆️

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