Audio V4: Do not forward notification detail

Those values are only for the framework, thus they should not be
available to the vendor.

Bug: 38184704
Test: compile
Change-Id: I05d3e506a85dbe66d51b7024fa9de45865bcf9db
Merged-In: I05d3e506a85dbe66d51b7024fa9de45865bcf9db
Cherry-picked from master
Signed-off-by: Kevin Rocard <krocard@google.com>