Refactor RAT/Network Type into one place

Created by: f3ndot

Agreements

• I have reviewed and accepted the guidelines for contributing to this project.
• I have reviewed and closely followed the Style Guide for this Android app.

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Overview

A simple refactor to move the central place for getting RAT/Network Type name into the Cell class.

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Classification

• Bugfix (non-breaking change which fixes an existing issue)
• New feature (non-breaking change which adds functionality)
• Breaking change (fix or feature that would cause existing functionality to not work as expected)

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• None of the above, just a refactor. No functional change (hopefully )