Linux/Android: Refactor MessageQ_create to Register Later with NameServer

Linux/Android: Refactor MessageQ_create to Register Later with NameServer

In the current MessageQ_create implementation, the NameServer
registration is done early, before local creation in the user
library is done. It is therefore possible that a remote core
could open a MessageQ that is still being created and put a
message to that MessageQ. This can result in dropped messages
or in the worst case a crash.

This patch moves the NameServer registration to the end of
the creation sequence so that the MessageQ cannot be opened
before it is fully created.

A new LAD command called MESSAGEQ_ANNOUNCE is added that is specifically
for registering a previously created MessageQ with the NameServer.

Once all creation is completed and the MessageQ is ready to
receive messages, the MessageQ_create api makes the call to LAD
MESSAGEQ_ANNOUNCE to register with the NameServer.

Signed-off-by: Angela Stegmaier <angelabaker@ti.com>