Add appsearch multiuser test

Test: atest --rebuild-module-info CtsAppSearchHostTestCases
Bug: 173553485
Change-Id: Ifb11ce65aa5fc8fc27846f715976dc7af3f92e00
diff --git a/apex/appsearch/testing/Android.bp b/apex/appsearch/testing/Android.bp
index 3c5082e..2518394 100644
--- a/apex/appsearch/testing/Android.bp
+++ b/apex/appsearch/testing/Android.bp
@@ -31,6 +31,7 @@
         "truth-prebuilt",
     ],
     visibility: [
+        "//cts/hostsidetests/appsearch",
         "//cts/tests/appsearch",
         "//vendor:__subpackages__",
     ],