[ANativeWindow] Add apex stub for getLastDequeueStartTime

Also adding private query64 hook so that timing queries can have
nanosecond precision. Otherwise with a 32-bit width we can only have
millisecond precision for timestamps and microsecond precision for time
intervals, and really we shouldn't need to be less precise if we can
help it.

Bug: 137012798
Test: libnativewindow_test
Change-Id: I62233a588eee80f7ea70b74824c8e47461a3be81