Add cell broadcast service tests to build

This is required in order to have the unit test run for presubmit (based
on b/74119270 from March 2018).

Bug: 135956699
Test: make -j continuous_instrumentation_tests,verify that test zip
contains the CellBroadcastServiceTest

Change-Id: I7bf3d4891fc258a1eda5a8f4b0513d5a898e2c9a
diff --git a/build/tasks/tests/instrumentation_test_list.mk b/build/tasks/tests/instrumentation_test_list.mk
index ac4bdbe..ff5980b 100644
--- a/build/tasks/tests/instrumentation_test_list.mk
+++ b/build/tasks/tests/instrumentation_test_list.mk
@@ -60,6 +60,7 @@
     RSTest \
     PrintSpoolerOutOfProcessTests \
     CellBroadcastReceiverUnitTests \
+    CellBroadcastServiceTests \
     TelephonyProviderTests \
     CarrierConfigTests \
     TeleServiceTests \