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: I44f554e711efadcd31de79b543f42c0afb27c23c
diff --git a/private/service_contexts b/private/service_contexts
index 1504bac..c07f958 100644
--- a/private/service_contexts
+++ b/private/service_contexts
@@ -56,6 +56,7 @@
 android.hardware.security.dice.IDiceDevice/default                   u:object_r:hal_dice_service:s0
 android.hardware.security.keymint.IKeyMintDevice/default             u:object_r:hal_keymint_service:s0
 android.hardware.security.keymint.IRemotelyProvisionedComponent/default u:object_r:hal_remotelyprovisionedcomponent_service:s0
+android.hardware.gatekeeper.IGatekeeper/default                      u:object_r:hal_gatekeeper_service:s0
 android.hardware.security.secureclock.ISecureClock/default             u:object_r:hal_secureclock_service:s0
 android.hardware.security.sharedsecret.ISharedSecret/default             u:object_r:hal_sharedsecret_service:s0
 android.hardware.sensors.ISensors/default                            u:object_r:hal_sensors_service:s0