Add TestApi to SUSPEND_APPS permission for GTS test.

Bug: 129911490
Test: atest com.google.android.wellbeing.permissionpolicy.gts.WellbeingPermissionPolicyTest
Change-Id: I61152f07987deb5c5c088d78ccd9ef79b09cbb95
diff --git a/core/res/AndroidManifest.xml b/core/res/AndroidManifest.xml
index fb92fbf..4e2f42a 100644
--- a/core/res/AndroidManifest.xml
+++ b/core/res/AndroidManifest.xml
@@ -1628,8 +1628,8 @@
         android:label="@string/permlab_bluetooth"
         android:protectionLevel="normal" />
 
-    <!-- @SystemApi Allows an application to suspend other apps, which will prevent the user
-         from using them until they are unsuspended.
+    <!-- @SystemApi @TestApi Allows an application to suspend other apps, which will prevent the
+         user from using them until they are unsuspended.
          @hide
     -->
     <permission android:name="android.permission.SUSPEND_APPS"