audiopolicy: align input and output devices for engine

No need to filter anymore the remote submix to engine as
both configurable and default engine take care of legacy remote
submix address (aka "0") and wont only care about type.

Bug: 130284799
Test: AudioPolicyEmulatorTests --gtest_filter=*.DynamicPolicyMixRecordInjectionTest.*
AudioPolicyEmulatorTests --gtest_filter=*.DynamicPolicyMixPlaybackReRoutingTest.*

Change-Id: Ia90c65ccfc51220a2344cecec2fbba7f2bad776a
Signed-off-by: François Gaffie <francois.gaffie@renault.com>