Use Search.SOURCE from android-common

The SOURCE (search source identifier) constant is moving
from hidden in android.app.SearchManager to com.android.common.Search.

Part of http://b/issue?id=2429556

Change-Id: I4eee5dbac6f0cee2947175915186a17d06dd9fec
diff --git a/Android.mk b/Android.mk
index b9a46f4..537ad60 100644
--- a/Android.mk
+++ b/Android.mk
@@ -3,7 +3,9 @@
 
 LOCAL_MODULE_TAGS := optional
 
-LOCAL_STATIC_JAVA_LIBRARIES := gsf-client
+LOCAL_STATIC_JAVA_LIBRARIES := \
+        android-common \
+        gsf-client
 
 LOCAL_SRC_FILES := \
         $(call all-subdir-java-files) \