CRAS HFP: Create hfp_iodev in hfp_ag_profile
CRAS HFP: Create hfp_iodev in hfp_ag_profile

BUG=chromium:232315
TEST=emerge-link adhd, connect to a bluetooth headset from UI,
Use cras_test_client --select_output to choose to HFP iodev.
Play audio and record audio can work now.

Change-Id: I96d9202bb55cedd2d80750b0c91b9775ecb6d589
Reviewed-on: https://chromium-review.googlesource.com/61379
Reviewed-by: Hsinyu Chao <8b91762bdbe27d3121b311091d7ca5125e9a8df6@chromium.org>
Commit-Queue: Hsinyu Chao <8b91762bdbe27d3121b311091d7ca5125e9a8df6@chromium.org>
Tested-by: Hsinyu Chao <8b91762bdbe27d3121b311091d7ca5125e9a8df6@chromium.org>

drinkcat/adhd,drinkcat/adhd,drinkcat/adhd,drinkcat/adhd,drinkcat/adhd,drinkcat/adhd