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

android/csuite_config.go

@@ -44,7 +44,7 @@ func (me *CSuiteConfig) AndroidMkEntries() []AndroidMkEntries {
 			if me.properties.Test_config != nil {
 				entries.SetString("LOCAL_TEST_CONFIG", *me.properties.Test_config)
 			}
-			entries.AddStrings("LOCAL_COMPATIBILITY_SUITE", "csuite")
+			entries.AddCompatibilityTestSuites("csuite")
 		},
 	}
 	return []AndroidMkEntries{androidMkEntries}