Support MobileViT

[yingfhu]

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Motivation

Please describe the motivation of this PR and the goal you want to achieve through this PR.

Modification

Please briefly describe what modification is made in this PR.

BC-breaking (Optional)

Does the modification introduce changes that break the backward compatibility of the downstream repositories?
If so, please describe how it breaks the compatibility and how the downstream projects should modify their code to keep compatibility with this PR.

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If this PR introduces a new feature, it is better to list some use cases here and update the documentation.

Checklist

Before PR:

• Pre-commit or other linting tools are used to fix the potential lint issues.
• Bug fixes are fully covered by unit tests, the case that causes the bug should be added in the unit tests.
• The modification is covered by complete unit tests. If not, please add more unit test to ensure the correctness.
• The documentation has been modified accordingly, like docstring or example tutorials.

After PR:

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• CLA has been signed and all committers have signed the CLA in this PR.

[mzr1996]

since no normalize, why the std is 255 instead of 1.

[yingfhu]

std=1 all pixels fall into range 0-255， in original repo，input should be in range 0-1

[codecov]

Codecov Report

Base: 0.02% // Head: 91.35% // Increases project coverage by +91.33% 🎉

Coverage data is based on head (65308ea) compared to base (b8b31e9).
Patch has no changes to coverable lines.

❗ Current head 65308ea differs from pull request most recent head 5dc9a94. Consider uploading reports for the commit 5dc9a94 to get more accurate results

Additional details and impacted files

@@             Coverage Diff              @@
##           dev-1.x    #1068       +/-   ##
============================================
+ Coverage     0.02%   91.35%   +91.33%     
============================================
  Files          121      130        +9     
  Lines         8217     9776     +1559     
  Branches      1368     1539      +171     
============================================
+ Hits             2     8931     +8929     
+ Misses        8215      649     -7566     
- Partials         0      196      +196     

Flag	Coverage Δ
unittests	91.35% <ø> (+91.33%)	⬆️

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

Impacted Files	Coverage Δ
mmcls/apis/inference.py	0.00% <0.00%> (ø)
mmcls/datasets/transforms/compose.py
mmcls/models/utils/layer_scale.py	86.66% <0.00%> (ø)
mmcls/models/backbones/swin_transformer_v2.py	89.47% <0.00%> (ø)
mmcls/models/backbones/edgenext.py	95.20% <0.00%> (ø)
mmcls/structures/utils.py	77.77% <0.00%> (ø)
mmcls/models/backbones/mobilevit.py	91.15% <0.00%> (ø)
mmcls/models/heads/efficientformer_head.py	93.10% <0.00%> (ø)
mmcls/models/backbones/mvit.py	92.46% <0.00%> (ø)
mmcls/models/backbones/deit3.py	94.52% <0.00%> (ø)
... and 120 more

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