frameworks/base: Fix status bar notification expansion when device orientation changes

Rotating the device 90 or 270 degrees triggers a display size change event, as display
coordinates transition from portrait to landscape mode.  Handler for this event
responds by expanding the status bar notification contents.  When the status bar
notification text encompasses the full screen (at least 5 notification messages), the
last entry in the notification overlaps the foreground application (e.g. Google map)
during rotation.  This causes a momentary flicker on top of the screen in landscape mode.

Change-Id: Ic6414071e4134001d268af5a8159ae359ee252c4
CRs-fixed: 248670