Allow multiple trust agents

This CL is essentially a one-line change that sets the
ONLY_ONE_TRUST_AGENT boolean to false.

Bug: 111431046
Test: Tested manually that this works correctly

Change-Id: Ia8f06235467e3223ef1e441a62d941a64a2d7c93

src/com/android/settings/security/trustagent/TrustAgentManager.java

@@ -53,7 +53,7 @@ import java.util.List;
 public class TrustAgentManager {
 
     // Only allow one trust agent on the platform.
-    private static final boolean ONLY_ONE_TRUST_AGENT = true;
+    private static final boolean ONLY_ONE_TRUST_AGENT = false;
 
     public static class TrustAgentComponentInfo {
         public ComponentName componentName;