Fix gpg key nvidia fabricmanager in amazon linux 2 and centos 7

[francesco-giordano]

NOTE

When the rotation will happen to the ubuntu key need to be changed accordingly

Description of changes

• Fix gpg key nvidia fabricmanager in amazon linux 2 and centos 7

Tests

• Tested manually the installation of nvidia fabricmanager on amazon linux 2
• Run build first stage

References

• [Closed] GPG key rotation NVIDIA/cuda-repo-management#1 (comment)
• [Closed] GPG key rotation NVIDIA/cuda-repo-management#1
• https://forums.developer.nvidia.com/t/gpg-error-http-developer-download-nvidia-com-compute-cuda-repos-ubuntu1804-x86-64/212904/2

Checklist

• Make sure you are pointing to the right branch and add a label in the PR title (i.e. 2.x vs 3.x)
• Check all commits' messages are clear, describing what and why vs how.
• Make sure to have added unit tests or integration tests to cover the new/modified code.
• Check if documentation is impacted by this change.

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By submitting this pull request, I confirm that my contribution is made under the terms of the Apache 2.0 license.

[chenwany]

LGTM!