Hide notification close button behind a config

The notification close/dismiss button was added but we want to hide it behind a config. The devices using mouse and touchpad can choose to enable the config.

Flag: NONE only shown with config_notificationCloseButtonSupported
enabled on pc emulator
Bug: 345281627
Test: manual with config on and off

Change-Id: Ifaa8a7c360941dae538a07754893b651e1307131
(cherry picked from commit 7eba38d2af0cf437837024191faca5f92095702d)