Register CrissCrossAttention into plugin layers

[yeliudev]

No description provided.

[codecov]

Codecov Report

Merging #1189 (2e5d4c0) into master (96c4b70) will increase coverage by 0.00%.
The diff coverage is 100.00%.

@@           Coverage Diff           @@
##           master    #1189   +/-   ##
=======================================
  Coverage   67.97%   67.98%           
=======================================
  Files         159      159           
  Lines       10434    10435    +1     
  Branches     1899     1900    +1     
=======================================
+ Hits         7093     7094    +1     
  Misses       2970     2970           
  Partials      371      371           

Flag	Coverage Δ
unittests	67.98% <100.00%> (+<0.01%)	⬆️

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Impacted Files	Coverage Δ
mmcv/ops/cc_attention.py	38.70% <100.00%> (+1.00%)	⬆️

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