dsp: adm: avoid FNN model memory unmap when closing non-FNN port

In VoIP FNN and audio record concurrence, FNN model shared memory
is wrong to unmap when audio record stop.

Fix it by checking FNN topology and app type to ensure the memory
is unmapped properly.

Change-Id: If24b6aa75d41b629a3ef33b9585d9d7d82aa9b25
Signed-off-by: Kunlei Zhang <kunleiz@codeaurora.org>