Add CellBroadcastServiceModule to mk

Bug: 135956699
Test: m -j30 (verify that build includes CellBroadcastServiceModule)
Change-Id: Ib2d734ba2ed3608a4255164e6e50dac349eb9a18
Merged-In: Ib2d734ba2ed3608a4255164e6e50dac349eb9a18
diff --git a/target/product/telephony_system.mk b/target/product/telephony_system.mk
index 4da9bdf..737436a 100644
--- a/target/product/telephony_system.mk
+++ b/target/product/telephony_system.mk
@@ -22,5 +22,6 @@
     CarrierDefaultApp \
     CallLogBackup \
     CellBroadcastAppPlatform \
+    CellBroadcastServiceModule \
 
 PRODUCT_COPY_FILES := \