Enforce permission when disabling API checks.

Add a new internal permission required to disable hidden API checks using
"am instrument". Grant this permission to the shell.

Test: $ adb shell am instrument --no-hidden-api-checks mypackage/.MainInstrumentation
Bug: 64382372

Change-Id: I193dba412560f17810ad0c67c733a1eec15fa7b7
diff --git a/packages/Shell/AndroidManifest.xml b/packages/Shell/AndroidManifest.xml
index b49f1ac..b4f331d 100644
--- a/packages/Shell/AndroidManifest.xml
+++ b/packages/Shell/AndroidManifest.xml
@@ -130,6 +130,7 @@
     <uses-permission android:name="android.permission.CHANGE_WIFI_STATE" />
     <uses-permission android:name="android.permission.SET_TIME" />
     <uses-permission android:name="android.permission.SET_TIME_ZONE" />
+    <uses-permission android:name="android.permission.DISABLE_HIDDEN_API_CHECKS" />
     <!-- Permission needed to rename bugreport notifications (so they're not shown as Shell) -->
     <uses-permission android:name="android.permission.SUBSTITUTE_NOTIFICATION_APP_NAME" />
     <!-- Permission needed to hold a wakelock in dumpstate.cpp (drop_root_user()) -->