[Enhancement] Revise the interface of upfirdn2d function

[nbei]

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Motivation

The StyleGAN2-ADA method needs a more general interface for the upfirdn2d function.

Modification

Just modify the interface of the upfirdn2d function to support more data types.

BC-breaking (Optional)

Does the modification introduce changes that break the backward-compatibility of the downstream repos?
No.

[codecov]

Codecov Report

Merging #1195 (004085b) into master (96c4b70) will decrease coverage by 0.03%.
The diff coverage is 37.93%.

❗ Current head 004085b differs from pull request most recent head ad2ab24. Consider uploading reports for the commit ad2ab24 to get more accurate results

@@            Coverage Diff             @@
##           master    #1195      +/-   ##
==========================================
- Coverage   67.97%   67.94%   -0.04%     
==========================================
  Files         159      160       +1     
  Lines       10434    10454      +20     
  Branches     1899     1905       +6     
==========================================
+ Hits         7093     7103      +10     
- Misses       2970     2978       +8     
- Partials      371      373       +2     

Flag	Coverage Δ
unittests	67.94% <37.93%> (-0.04%)	⬇️

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

Impacted Files	Coverage Δ
mmcv/cnn/utils/weight_init.py	91.34% <ø> (ø)
mmcv/runner/hooks/evaluation.py	86.70% <ø> (ø)
mmcv/runner/iter_based_runner.py	60.00% <0.00%> (+2.14%)	⬆️
mmcv/ops/upfirdn2d.py	14.58% <7.69%> (-0.72%)	⬇️
mmcv/utils/trace.py	54.54% <54.54%> (ø)
mmcv/image/photometric.py	99.27% <100.00%> (+<0.01%)	⬆️
mmcv/ops/cc_attention.py	38.70% <100.00%> (+1.00%)	⬆️
mmcv/utils/__init__.py	88.88% <100.00%> (+0.65%)	⬆️

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[zhouzaida]

LGTM