Change android.permission.RESTRICTED_VR_ACCESS to SystemAPI

android.permission.RESTRICTED_VR_ACCESS is currently an open API. But
since it can only be used by System Apps because of it's protection
level which is "signature|preinstalled". Change this to a @SystemApi.

Bug: 37724255
Test: run gts --module GtsPermissionTestCases
1. Run with two apps having android.permission.RESTRICTED_VR_ACCESS
   before change -- fails.
2. Run with two apps having android.permission.RESTRICTED_VR_ACCESS
   after this change -- passes.

Change-Id: Ib59df550e6552eebc1ef45dec3cfc6184b461c39
Signed-off-by: Karthik Ravi Shankar <karthikrs@google.com>
diff --git a/tests/tests/permission2/res/raw/android_manifest.xml b/tests/tests/permission2/res/raw/android_manifest.xml
index 3564b21..ebeb1de 100644
--- a/tests/tests/permission2/res/raw/android_manifest.xml
+++ b/tests/tests/permission2/res/raw/android_manifest.xml
@@ -3334,6 +3334,8 @@
         android:protectionLevel="signature" />
 
     <!-- Must be required by system apps when accessing restricted VR APIs.
+         @hide
+         @SystemApi
          <p>Protection level: signature -->
     <permission android:name="android.permission.RESTRICTED_VR_ACCESS"
         android:protectionLevel="signature|preinstalled" />