Add inputflinger unit tests to device-platinum-tests suite

Change-Id: Ia5de14f81e5050efe224a3bed5bfd2cb58f6af57
diff --git a/services/inputflinger/tests/Android.bp b/services/inputflinger/tests/Android.bp
index cf0d46a..bea457b 100644
--- a/services/inputflinger/tests/Android.bp
+++ b/services/inputflinger/tests/Android.bp
@@ -115,5 +115,8 @@
     test_options: {
         unit_test: true,
     },
-    test_suites: ["device-tests"],
+    test_suites: [
+        "device-tests",
+        "device-platinum-tests",
+    ],
 }