Add device admin to wearables for API8 Compat

Bug:13386441
Change-Id: I8814976db791bb1f2e60b6a9fc49afdd5f360414
diff --git a/data/etc/wearable_core_hardware.xml b/data/etc/wearable_core_hardware.xml
index b2ffab7..215665f 100644
--- a/data/etc/wearable_core_hardware.xml
+++ b/data/etc/wearable_core_hardware.xml
@@ -36,6 +36,9 @@
     <feature name="android.software.home_screen" />
     <feature name="android.software.input_methods" />
 
+    <!-- Feature to specify if the device supports adding device admins. -->
+    <feature name="android.software.device_admin" />
+
     <!-- devices with GPS must include android.hardware.location.gps.xml -->
     <!-- devices with an autofocus camera and/or flash must include either
          android.hardware.camera.autofocus.xml or