audioflinger: Allow encoded PCM for RecordThread

Change the fatal condition in AudioFlinger::RecordThread to info.
Require AUDIO_INPUT_FLAG_DIRECT when creating tracks on such streams
from the client side. Note that PatchPanel uses PatchRecord constructor
directly.

Bug: 63901775
Test: on MSD prototype
Change-Id: Ic94e51e6b8a089f3100131851db8c3ce0994b4ac