Increases TC Logging Visibility for testing

Test: Run Telecom unit tests.
Change-Id: Ie7a61c60f0a7a9bbc024741c668299efafa5e18d

telecomm/java/android/telecom/Log.java

@@ -325,7 +325,8 @@ public class Log {
         return sEventManager;
     }
 
-    private static SessionManager getSessionManager() {
+    @VisibleForTesting
+    public static SessionManager getSessionManager() {
         // Checking for null again outside of synchronization because we only need to synchronize
         // during the lazy loading of the session logger. We don't need to synchronize elsewhere.
         if (sSessionManager == null) {