fix trying to use AMDGPU in Base

[RustyBamboo]

Remove loading AMDGPU in AMDGPUext. This fixes the following:

julia> using AMDGPU, OMEinsum
Precompiling AMDGPUExt
        Info Given AMDGPUExt was explicitly requested, output will be shown live 
[ Info: OMEinsum loaded the AMDGPU module successfully
ERROR: LoadError: ArgumentError: Package Base does not have AMDGPU in its dependencies:
- You may have a partially installed environment. Try `Pkg.instantiate()`
  to ensure all packages in the environment are installed.
- Or, if you have Base checked out for development and have
  added AMDGPU as a dependency but haven't updated your primary
  environment's manifest file, try `Pkg.resolve()`.
- Otherwise you may need to report an issue with Base
Stacktrace:
...

[codecov-commenter]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 82.61%. Comparing base (8c07022) to head (64c81fb).
Report is 2 commits behind head on master.

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Additional details and impacted files

@@            Coverage Diff             @@
##           master     #167      +/-   ##
==========================================
- Coverage   88.88%   82.61%   -6.28%     
==========================================
  Files          14       15       +1     
  Lines        1080     1162      +82     
==========================================
  Hits          960      960              
- Misses        120      202      +82     

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[GiggleLiu]

Makes sense to me. @radudiaconu0 is it safe if I merge this PR directly?

[radudiaconu0]

Sure