Fix CarrierSignalAgent Unit test failure

Bug: 29579544
Test: runtest CarrierSignalAgentTest.java
Change-Id: I3739daf392c2b952f3229f64c41a6f8911f417fc
Merged-in: I3739daf392c2b952f3229f64c41a6f8911f417fc
(cherry picked from commit 51bc384d21281499e6b50099d64df7f448016d62)
1 file changed