CoreTelephony should not be added to tvOS builds

[marandaneto]

What does this PR do?

CoreTelephony should not be added to tvOS builds

Where should the reviewer start?

How should this be manually tested?

Any background context you want to provide?

When integrating the SDK with PMs such as Carthage, the PM tries to use CoreTelephony for tvOS as well and it fails

What are the relevant tickets?

Screenshots or screencasts (if UI/UX change)

Questions:

• Does the docs need an update?
• Are there any security concerns?
• Do we need to update engineering / success?