Specify NNAPI Burst FMQ read/write requirements

This CL additionally adds missing documentation for timing
information when returning results on the resultChannel.

Bug: 133773876
Test: mma
Change-Id: I1eb1affbb4a912d5fdeab012e2be7e7005deb04d
Merged-In: I1eb1affbb4a912d5fdeab012e2be7e7005deb04d
(cherry picked from commit f99bffd0)