Marking used instant apps fields as System API

Change-Id: I4a907600b9fa75b1789843a9c2e7d2c33aaaff6b
Fixes: 71852699
Bug: 72450666
Bug: 72700831
Test: builds and AIA still functional
diff --git a/core/java/android/content/pm/ApplicationInfo.java b/core/java/android/content/pm/ApplicationInfo.java
index f6697e8..db1630b 100644
--- a/core/java/android/content/pm/ApplicationInfo.java
+++ b/core/java/android/content/pm/ApplicationInfo.java
@@ -958,6 +958,7 @@
      * Version of the sandbox the application wants to run in.
      * @hide
      */
+    @SystemApi
     public int targetSandboxVersion;
 
     /**
@@ -1655,7 +1656,11 @@
         return (privateFlags & ApplicationInfo.PRIVATE_FLAG_FORWARD_LOCK) != 0;
     }
 
-    /** @hide */
+    /**
+     * True if the application is installed as an instant app.
+     * @hide
+     */
+    @SystemApi
     public boolean isInstantApp() {
         return (privateFlags & ApplicationInfo.PRIVATE_FLAG_INSTANT) != 0;
     }