Also add embedded padding when icon is StatusBarNotificationIcon

StatusBarNotificationIcon will later be used to instantiate a
StatusBarIconView, which requires embedded padding.

Fixes: 384695757
Bug: 386372350
Flag: com.android.systemui.status_bar_connected_displays
Test: Manual - See before and after screenshots
Change-Id: I19adff13085549505eaf66f7adb9074b0604371e