STS include missing apps from EphemeralTest

Bug: Bug: 168718431
Test: sts-tradefed run sts-engbuild-no-spl-lock -m CtsAppSecurityHostTestCases -t android.appsecurity.cts.EphemeralTest
Change-Id: Ifac667a3667727815f3c0b789ed8816035266802
diff --git a/hostsidetests/appsecurity/test-apps/EphemeralTestApp/EphemeralApp2/Android.bp b/hostsidetests/appsecurity/test-apps/EphemeralTestApp/EphemeralApp2/Android.bp
index 7cae048..767ea90 100644
--- a/hostsidetests/appsecurity/test-apps/EphemeralTestApp/EphemeralApp2/Android.bp
+++ b/hostsidetests/appsecurity/test-apps/EphemeralTestApp/EphemeralApp2/Android.bp
@@ -32,6 +32,7 @@
         "cts",
         "vts",
         "general-tests",
+        "sts",
     ],
     srcs: ["src/**/*.java"],
     resource_dirs: ["res"],