Fix 'PolicyPlatformOperatingSystemType': OSX -> MACOS + adding CHROMEOS

[dparolla]

Summary

Obvious Fix: Fixes a bug when trying to read a policy rule with "MacOs" or "ChromeOS" platform condition. Current error: Failed to unmarshal ListPolicyRules200ResponseInner as AccessPolicyRule: MACOS is not a valid PolicyPlatformOperatingSystemType

Fixes # N/A

Type of PR

• [x] Bug Fix (non-breaking fixes to existing functionality)
• [ ] New Feature (non-breaking changes that add new functionality)
• [ ] Documentation update
• [ ] Test Updates
• [ ] Other (Please describe the type)

Test Information

• [ ] My PR required test updates

Go Version: Os Version: OpenAPI Spec Version:

Signoff

• [ ] I have submitted a CLA for this PR
• [x] Each commit message explains what the commit does
• [ ] I have updated documentation to explain what my PR does
• [ ] My code is covered by tests if required
• [x] I ran make fmt on my code
• [x] I did not edit any automatically generated files

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