Use VsyncEventData in DisplayEventReceiver::Event.

Clean-up that re-uses VsyncEventData so it's easier to maintain.
The ParcelableVsyncEventData is used in AIDL. It is separated from
VsyncEventData because of the union in
DisplayEventReceiver::Event and Parcelable has non-trivial
constructors.

Bug: 218563993
Test: atest ChoreographerNativeTest
Test: atest libsurfaceflinger_unittest
Test: atest libgui_test
Change-Id: I3ebeb1c7826300c27c4a12d4dba6fbd16305e9e1