Renamed vision.h files to vision_cpu.h and vision_cuda.h

[ShahriarRezghi]

@fmassa I renamed the headers.

[codecov-io]

Codecov Report

Merging #1051 into master will increase coverage by 0.05%.
The diff coverage is n/a.

@@            Coverage Diff             @@
##           master    #1051      +/-   ##
==========================================
+ Coverage   63.87%   63.92%   +0.05%     
==========================================
  Files          66       66              
  Lines        5273     5273              
  Branches      793      793              
==========================================
+ Hits         3368     3371       +3     
+ Misses       1673     1671       -2     
+ Partials      232      231       -1

Impacted Files	Coverage Δ
torchvision/transforms/transforms.py	82.73% <0%> (+0.6%)	⬆️

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