Update some APIs based on the 7.2 API review comments

* NotificationConfiguration "helpers" removed from Notification
* NotificationConfiguration methods accept Type instead of style (String)
* Tab.setIconAltText -> Tab.setIconAlternateText
* Remove the two new TabSheet.addTab() methods
* UI.reinit() -> UI.refresh()

Change-Id: I97488e7c6de8cfacc591450d69c821b2973b8707