Merge AppSearchImpl Jetpack work from last two quarters.

This switches AppSearch from FakeIcing to the real libicing.

Bug: 162450968
Test: AppSearchManagerTest, AppSearchImplTest
Change-Id: I9ecbe4ce229e4ac9756aa187ad82ba60420a644e
diff --git a/services/tests/servicestests/Android.bp b/services/tests/servicestests/Android.bp
index 7fc6bbd7..1f72374 100644
--- a/services/tests/servicestests/Android.bp
+++ b/services/tests/servicestests/Android.bp
@@ -78,6 +78,7 @@
         "libbinder",
         "libc++",
         "libcutils",
+        "libicing",
         "liblog",
         "liblzma",
         "libnativehelper",