Modify return values for requestRead/Write and FMQ config methods.

Bug: 31780470
Test: Built and ran all FMQ unit tests/benchmarks.

Modify return values for requestRead/Write and FMQ config methods
to return a bool status instead of an error code/number of bytes
read/written.

Change-Id: I640403bb35f6a56259d98581f9a722025436ff8b
4 files changed