[SofaCUDA] FIX namespaces

[guparan]

When trying to re-enable SofaCUDA on our Linux CI, I faced some namespace errors due to NG work. Hope my fixes are good.

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Reviewers will merge this pull-request only if

• it builds with SUCCESS for all platforms on the CI.
• it does not generate new warnings.
• it does not generate new unit test failures.
• it does not generate new scene test failures.
• it does not break API compatibility.
• it is more than 1 week old (or has fast-merge label).

[guparan]

Build failure on Ubuntu is weird. Seems related to CGAL but I'm not even sure. Can you check this @hugtalbot ? https://ci.inria.fr/sofa-ci-dev/job/sofa-framework/job/PR-2935/CI_CONFIG=ubuntu_gcc,CI_PLUGINS=options,CI_TYPE=release/6/console

[alxbilger]

Build failure on Ubuntu is weird. Seems related to CGAL but I'm not even sure. Can you check this @hugtalbot ? https://ci.inria.fr/sofa-ci-dev/job/sofa-framework/job/PR-2935/CI_CONFIG=ubuntu_gcc,CI_PLUGINS=options,CI_TYPE=release/6/console

The system probably killed the compilation because it took too many resources. Restart the compilation could maybe make it.

[alxbilger]

@fredroy @guparan is this PR completely replaced by https://github.com/sofa-framework/sofa/pull/2975 ?

[fredroy]

@fredroy @guparan is this PR completely replaced by #2975 ?

Should be

[fredroy]

[ci-build][with-all-tests]

[epernod]

[ci-build][with-all-tests]

[hugtalbot]

looks good to me @epernod but not locally tested

[epernod]

I'm gonna double check locally and if it is fine I'll merge