[AChoreographer] Consolidate AChoreographer source files

Now that AChroeographer is defined in libnativedisplay, libandroid
should not need its own copy. Instead what we do is:
* Statically link libnativedisplay into libandroid
* Delete choreographer.cpp

This structure is the same as that of ANativeWindow.

Bug: 136262896
Test: builds
Change-Id: I159d69398bb33ccd7b01aae798d14c04438355c1