[Fix] Fix wrap_fp16_model import

[yezhen17]

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Motivation

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Fix a deprecated import.

Modification

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BC-breaking (Optional)

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Use cases (Optional)

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Checklist

1. Pre-commit or other linting tools are used to fix the potential lint issues.
2. The modification is covered by complete unit tests. If not, please add more unit test to ensure the correctness.
3. If the modification has potential influence on downstream projects, this PR should be tested with downstream projects.
4. The documentation has been modified accordingly, like docstring or example tutorials.

[codecov]

Codecov Report

Merging #861 (839f6fc) into master (31ef559) will increase coverage by 0.25%.
The diff coverage is n/a.

@@            Coverage Diff             @@
##           master     #861      +/-   ##
==========================================
+ Coverage   49.07%   49.32%   +0.25%     
==========================================
  Files         210      210              
  Lines       15961    16019      +58     
  Branches     2547     2556       +9     
==========================================
+ Hits         7833     7902      +69     
+ Misses       7626     7614      -12     
- Partials      502      503       +1     

Flag	Coverage Δ
unittests	49.32% <ø> (+0.25%)	⬆️

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

Impacted Files	Coverage Δ
mmdet3d/datasets/s3dis_dataset.py	88.57% <0.00%> (-6.10%)	⬇️
mmdet3d/datasets/__init__.py	100.00% <0.00%> (ø)
mmdet3d/datasets/pipelines/formating.py	60.00% <0.00%> (ø)
mmdet3d/models/detectors/single_stage_mono3d.py	16.66% <0.00%> (ø)
mmdet3d/datasets/pipelines/transforms_3d.py	90.46% <0.00%> (+0.05%)	⬆️
mmdet3d/core/points/base_points.py	85.00% <0.00%> (+1.47%)	⬆️
mmdet3d/core/bbox/structures/coord_3d_mode.py	63.82% <0.00%> (+2.83%)	⬆️
mmdet3d/ops/pointnet_modules/paconv_sa_module.py	74.60% <0.00%> (+23.80%)	⬆️

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