audio: Fix false positives in audio_is_remote_submix_device()

The audio_is_remote_submix_device() helper function incorrectly
reported AUDIO_DEVICE_OUT_BLUETOOTH_A2DP_HEADPHONES and
AUDIO_DEVICE_IN_LINE as a submix devices.

The cases where the confusion occurs are for devices whose bitwise
value only differs in the direction bit.

Change-Id: I3bb9fd1158a26a8f4b3b59246974e703ca5ba0f0
Signed-off-by: Misael Lopez Cruz <misael.lopez@ti.com>