avdtp : Use kernel streaming mode

avdtp : Use kernel streaming mode

[Problem] If BT controller's buffer is occupied by another profile
 such as OPP or SPP, and it is blocked due to RF condition,
 A2DP packets for another device couldn't be sent properly.
 It causes the A2DP chopping issue because it does not have
 available buffer though RF is available.

[Cause & Measure] HCI buffer is limited but another tx requests occupy it.
 It causes audio sreaming packet delay.
 Because of this issue, streaming mode has been implemented in Kernel.
 This patch uses that feature as per avdtp state.

[Checking Method] Connect Bluetooth headset to DUT -> Play Music on DUT ->
 Install watchface on DUT or send some files from DUT to other remote device ->
 Observe BT audio quality

Change-Id: Ia00fa75b2ab6bd90f0373ad1605cabf5a5aa305e