liboboe: add _STREAM_ to OBOE_STATE, general cleanup of comments

See comments from https://googleplex-android-review.git.corp.google.com/#/c/1642945/

Test: just headers, nothing to test

Change-Id: I0d8d0c721c6371115ee565add7352fa4db748ba4
Signed-off-by: Phil Burk <philburk@google.com>
2 files changed