[bt][avdtp] Add Open, Close, Start, Suspend

Add the Open, Close, Start, and Suspend messages.

NET-1547 #done
NET-1548 #done

Test: fx run-test avdtp_lib_test_rustc
Change-Id: Icbfdf6e1a051fd6ea114759987e9a1db9c0af7b6
2 files changed