[Refactor] Use MMCV MODEL_REGISTRY

[Wuziyi616]

Note: this requires MMCV>=1.3.2!

[codecov]

Codecov Report

Merging #495 (d5e3ea6) into master (25a1bca) will decrease coverage by 0.00%.
The diff coverage is 96.77%.

❗ Current head d5e3ea6 differs from pull request most recent head 32e7186. Consider uploading reports for the commit 32e7186 to get more accurate results

@@            Coverage Diff             @@
##           master     #495      +/-   ##
==========================================
- Coverage   50.65%   50.64%   -0.01%     
==========================================
  Files         191      188       -3     
  Lines       14452    14450       -2     
  Branches     2366     2366              
==========================================
- Hits         7320     7318       -2     
  Misses       6640     6640              
  Partials      492      492              

Flag	Coverage Δ
unittests	50.64% <96.77%> (-0.01%)	⬇️

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

Impacted Files	Coverage Δ
mmdet3d/models/builder.py	90.62% <93.75%> (+1.73%)	⬆️
mmdet3d/datasets/builder.py	60.71% <100.00%> (+1.45%)	⬆️
mmdet3d/datasets/pipelines/dbsampler.py	79.86% <100.00%> (ø)
mmdet3d/datasets/pipelines/transforms_3d.py	86.92% <100.00%> (ø)
mmdet3d/models/__init__.py	100.00% <100.00%> (ø)
mmdet3d/models/fusion_layers/point_fusion.py	67.02% <100.00%> (ø)
mmdet3d/models/fusion_layers/vote_fusion.py	93.33% <100.00%> (ø)
mmdet3d/models/middle_encoders/pillar_scatter.py	78.04% <100.00%> (ø)
mmdet3d/models/middle_encoders/sparse_encoder.py	75.86% <100.00%> (ø)
mmdet3d/models/middle_encoders/sparse_unet.py	97.70% <100.00%> (ø)
... and 4 more

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