Add support for RAT-based TCP buffer sizes

If the RAT-based resource overlay is not set,
config_tcp_buffers will be used instead.

Test: atest FrameworksTelephonyTests
Bug: 222323543
Change-Id: I1418518289a0d37c33dbadfbd9561df710e67105
Merged-In: I1418518289a0d37c33dbadfbd9561df710e67105
2 files changed