InputDispatcher: Create new EventEntries for events with zero-ed coords

The InputConfig flag ZERO_COORDS modifieds the coordinates of an event
before sending them to windows. Treat these events as new synthesized
events by creating a new EventEntry when zeroing the coords.

Bug: 316355518
Bug: 210460522
Test: atest inputflinger_tests
Change-Id: I8c50a5977f7a491a7b73a8bacf2a0087135108fb