Bluetooth: Add constants for SCO airmode

This patch defines constants for SCO airmode from SCO voice setting. It
refers to Bluetooth Core V4.0 specification, Part E, Chap 6.12 which
describe SCO voice setting format.

Signed-off-by: Frédéric Dalleau <frederic.dalleau@linux.intel.com>
Acked-by: Marcel Holtmann <marcel@holtmann.org>
Signed-off-by: Johan Hedberg <johan.hedberg@intel.com>
Signed-off-by: Gustavo Padovan <gustavo.padovan@collabora.co.uk>
diff --git a/include/net/bluetooth/hci_core.h b/include/net/bluetooth/hci_core.h
index 307a192..f403509 100644
--- a/include/net/bluetooth/hci_core.h
+++ b/include/net/bluetooth/hci_core.h
@@ -1215,4 +1215,8 @@
 
 u8 bdaddr_to_le(u8 bdaddr_type);
 
+#define SCO_AIRMODE_MASK       0x0003
+#define SCO_AIRMODE_CVSD       0x0000
+#define SCO_AIRMODE_TRANSP     0x0003
+
 #endif /* __HCI_CORE_H */