hidl2aidl: conversion of gatekeeper hidl to aidl

Conversion of the gatekeeper hidl interface to stable aidl interface.

Bug: 205760843
Test: run vts -m VtsHalGatekeeperTarget
Change-Id: Iacba60935581c38348437875b452aeb4b5121f9e
diff --git a/gatekeeper/OWNERS b/gatekeeper/OWNERS
new file mode 100644
index 0000000..d95b856
--- /dev/null
+++ b/gatekeeper/OWNERS
@@ -0,0 +1,2 @@
+swillden@google.com
+guangzhu@google.com