Update signal strength on ServiceState in service

Test: make RunSettingsRobotTests
Bug: 167643728
Change-Id: Ibf69f9e9ec2acafef1316069d37b8d2a27d7d4d7
Merged-In: Ibf69f9e9ec2acafef1316069d37b8d2a27d7d4d7
(cherry picked from commit 3b3704d693caf720ef0cc258750f8dacedd10583)
2 files changed