rootdir: Add stub vintf xml with android.system.keystore2

Ensure framework build-time interface verification sees IKeystoreService/default as available.

Author: fredldotme

rootdir/Android.mk

@@ -41,3 +41,11 @@ LOCAL_MODULE_TAGS  := optional
 LOCAL_MODULE_CLASS := EXECUTABLES
 LOCAL_SRC_FILES    := bin/on-post-data.sh
 include $(BUILD_PREBUILT)
+
+include $(CLEAR_VARS)
+LOCAL_MODULE       := vintf-stub.xml
+LOCAL_MODULE_TAGS  := optional
+LOCAL_MODULE_CLASS := ETC
+LOCAL_SRC_FILES    := etc/vintf-stub.xml
+LOCAL_MODULE_PATH  := $(TARGET_OUT_ETC)/vintf/manifest
+include $(BUILD_PREBUILT)

rootdir/etc/vintf-stub.xml

@@ -0,0 +1,10 @@
+<manifest version="1.0" type="framework">
+    <hal format="aidl">
+        <name>android.system.keystore2</name>
+        <version>2</version>
+        <interface>
+            <name>IKeystoreService</name>
+            <instance>default</instance>
+        </interface>
+    </hal>
+</manifest>