audio: Legacy: Use BT sound card

Starting in kernel-3.14, Bluetooth SCO audio has a separate sound
card. Previously, BT SCO was a PCM device of the primary card.
The index of the BT SCO card is found dynamically when present in
the system.

Change-Id: I5c24e07df48b836473ce56170f9b12e5aac9f975
Signed-off-by: Misael Lopez Cruz <misael.lopez@ti.com>
1 file changed