Add test suite handling to central androidmk code

MTS is introducing partial MTS test suites that are per-module, with
names of the format: mts-${MODULE}. By centralizing the code for test
suites, we can automatically add "mts" test suite when an
"mts-${MODULE}" test suite is specified, reducing duplication.

Test: m mts
Bug: 170318013
Change-Id: I8ce9d3c252fcc0a937bb5f2826d21cb6c6932d82
diff --git a/rust/androidmk.go b/rust/androidmk.go
index 4e8b14d..c181d67 100644
--- a/rust/androidmk.go
+++ b/rust/androidmk.go
@@ -90,7 +90,7 @@
 	test.binaryDecorator.AndroidMk(ctx, ret)
 	ret.Class = "NATIVE_TESTS"
 	ret.ExtraEntries = append(ret.ExtraEntries, func(entries *android.AndroidMkEntries) {
-		entries.AddStrings("LOCAL_COMPATIBILITY_SUITE", test.Properties.Test_suites...)
+		entries.AddCompatibilityTestSuites(test.Properties.Test_suites...)
 		if test.testConfig != nil {
 			entries.SetString("LOCAL_FULL_TEST_CONFIG", test.testConfig.String())
 		}