Update XML template to reflect null device.

Ravenwood doesn't need a device, so add a "null" filter so that
atest doesn't hang waiting for one.

Bug: 292141694
Test: atest-dev CtsOsTestCasesRavenwood CtsOsTestCases
Merged-in: I10ceeae92c7622ea44ecbc315e23babe8b36516a
Change-Id: I10ceeae92c7622ea44ecbc315e23babe8b36516a
diff --git a/core/ravenwood_test_config_template.xml b/core/ravenwood_test_config_template.xml
index b900268..0cae135 100644
--- a/core/ravenwood_test_config_template.xml
+++ b/core/ravenwood_test_config_template.xml
@@ -22,6 +22,7 @@
     <option name="use-ravenwood-resources" value="true" />
     <option name="exclude-paths" value="java" />
     <option name="socket-timeout" value="10000" />
+    <option name="null-device" value="true" />
 
     {EXTRA_CONFIGS}