Send componentName via extra for Accessibility usage notification

Send componentName via extra instead of idenfifier for Accessibility
usage notification intents because the identifier is used to identify
different intents only. The formal way to send data is via extra, thus
the notification can be launched by adb command.

Bug: 176965357
Test: enable a11y service and execute adb command below.
adb shell am broadcast -a PolicyWarningUIController.ACTION_SEND_NOTIFICATION
-p android --receiver-permission android.permission.MANAGE_ACCESSIBILITY
--ei android.intent.extra.USER_ID 0
--ecn android.intent.extra.COMPONENT_NAME xxx/yyy

Change-Id: I898b66efc05f0144981dd16bd92d719c756b4c2d