Dumpstate aidl: add cancelBugreport

This allows adding a cancel method to the bugreporting API. Note that it
is implemented on the java side.

Also removed unused args from onFinished.

BUG: 111441001
Test: adb shell /data/nativetest64/dumpstate_test/dumpstate_test

Change-Id: I6a3a0d652c89dc157de4a4056ccddc40e5d6e549
diff --git a/cmds/dumpstate/dumpstate.cpp b/cmds/dumpstate/dumpstate.cpp
index 2824c82..f6423df 100644
--- a/cmds/dumpstate/dumpstate.cpp
+++ b/cmds/dumpstate/dumpstate.cpp
@@ -2216,9 +2216,7 @@
     if (listener_ != nullptr) {
         switch (status) {
             case Dumpstate::RunStatus::OK:
-                // TODO(b/111441001): duration argument does not make sense. Remove.
-                listener_->onFinished(0 /* duration */, options_->notification_title,
-                                      options_->notification_description);
+                listener_->onFinished();
                 break;
             case Dumpstate::RunStatus::HELP:
                 break;