Add CarrierConfigManager APIs to support 5G Signal Strength Threshold

Test: Build
Bug: 135717625
Change-Id: I27b1c093be925aafaaa2302a368dd0c217a072d7
Merged-In: I27b1c093be925aafaaa2302a368dd0c217a072d7
(cherry picked from commit 8c1e873aa45f2fb5806e641f744fc3eb54aa3544)
2 files changed