Add VINTF manifest for android.system.keystore2

A VINTF manifest is required for services that expose VINTF stability
interfaces. Now that libbinder_rs supports stability, we need to update
this usage.

Test: m && adb shell start keystore2
Bug: 179907868
Change-Id: I9d3b363c6315bace145385867a5c495bb9051870
diff --git a/keystore2/android.system.keystore2-service.xml b/keystore2/android.system.keystore2-service.xml
new file mode 100644
index 0000000..6b8d0cb
--- /dev/null
+++ b/keystore2/android.system.keystore2-service.xml
@@ -0,0 +1,9 @@
+<manifest version="1.0" type="framework">
+    <hal format="aidl">
+        <name>android.system.keystore2</name>
+        <interface>
+            <name>IKeystoreService</name>
+            <instance>default</instance>
+        </interface>
+    </hal>
+</manifest>