[Improve] Use MMCV load_state_dict func in ViT/Swin

[xvjiarui]

Motivation

ViT/Swin backbone are using nn.Module.load_state_dict to load pre-trained model. This function will return incompatible keys instead of printing them.

Modification

Change to MMCV load_state_dict func in ViT/Swin will log out incompatible keys.

BC-breaking (Optional)

No

[codecov]

Codecov Report

Merging #1272 (6a787b9) into master (b4314f9) will not change coverage.
The diff coverage is 50.00%.

@@           Coverage Diff           @@
##           master    #1272   +/-   ##
=======================================
  Coverage   90.26%   90.26%           
=======================================
  Files         130      130           
  Lines        7553     7553           
  Branches     1257     1257           
=======================================
  Hits         6818     6818           
  Misses        528      528           
  Partials      207      207           

Flag	Coverage Δ
unittests	90.26% <50.00%> (ø)

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

Impacted Files	Coverage Δ
mmseg/models/backbones/swin.py	83.62% <33.33%> (ø)
mmseg/models/backbones/vit.py	90.18% <66.66%> (ø)

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