audiopolicy: effects: preprocessing session not attached on right input

Bug: 267799634
Test: make

When an audio record is using a preferred device, and when it attaches
an effect to its session, the effect may not be attached to the right input.

Change-Id: I9e80cfde000a8a46fd21b19c4588c631f8512e3a
Signed-off-by: François Gaffie <francois.gaffie@renault.com>