flexibility for having extra policy files

add an interface to accept a list of additional policy files, instead of just a single file.
Also add TEST_MAPPING for presubmit.

Bug: 147914640
Test: boot with empty, 1, and 2 element lists, atest
Change-Id: I97e8e0ec7b68699838595c09a4a8e7c7eef657c3
Merged-In: I97e8e0ec7b68699838595c09a4a8e7c7eef657c3
(cherry picked from commit 11c1a68778c39564ed37e653d7af6881a2d11ea6)
diff --git a/services/minijail/Android.bp b/services/minijail/Android.bp
index 0713a87..5ea6d1e 100644
--- a/services/minijail/Android.bp
+++ b/services/minijail/Android.bp
@@ -39,4 +39,5 @@
     srcs: [
         "av_services_minijail_unittest.cpp",
     ],
+    test_suites: ["device-tests"],
 }