Tag test cases used in permission MTS as MTS.

Including CtsPermissionTestCases, CtsBackupTestCases and
CtsDevicePolicyManagerTestCases.

Fixes: 171440874
Test: make sure the below matches for all 3 test cases
Test: grep -r test_suites | wc -l
Test: grep -r '"mts"' | wc -l
Change-Id: I55ef6ff164c7603d7622a55fe57287f29f1add3a
diff --git a/hostsidetests/devicepolicy/app/CrossProfileTestApps/CrossProfileEnabledApp/Android.bp b/hostsidetests/devicepolicy/app/CrossProfileTestApps/CrossProfileEnabledApp/Android.bp
index 4d56254..5f3ef94 100644
--- a/hostsidetests/devicepolicy/app/CrossProfileTestApps/CrossProfileEnabledApp/Android.bp
+++ b/hostsidetests/devicepolicy/app/CrossProfileTestApps/CrossProfileEnabledApp/Android.bp
@@ -30,5 +30,6 @@
     test_suites: [
         "cts",
         "general-tests",
+        "mts",
     ],
 }