Apply revised TrustAgent API

Bug: 14997466
Change-Id: I3261d238bf5c6ba12eaa4259c7e06e8b41698213
diff --git a/src/com/android/settings/TrustAgentSettings.java b/src/com/android/settings/TrustAgentSettings.java
index f209ca5..d31436d 100644
--- a/src/com/android/settings/TrustAgentSettings.java
+++ b/src/com/android/settings/TrustAgentSettings.java
@@ -158,8 +158,8 @@
                     && type != XmlPullParser.START_TAG) {
             }
             String nodeName = parser.getName();
-            if (!"trust_agent".equals(nodeName)) {
-                Slog.w(TAG, "Meta-data does not start with trust_agent tag");
+            if (!"trust-agent".equals(nodeName)) {
+                Slog.w(TAG, "Meta-data does not start with trust-agent tag");
                 return null;
             }
             TypedArray sa = res