4a: Add Bluetooth in 4a

4a: Add Bluetooth in 4a

This commit bump '4a-hal-generic' and '4a-softmixer' to support
bluetooth in 4a.

4a-hal-generic:
* 9663aa7 Add hal json with bluetooth for reference boards
* 4d00451 Handle error send by Bluetooth-Manager
* 78a4665 Get bluetooth device interface from path in HalBt
* 65cd769 Correct a typo in debug print of Hal-Bt plugin
* 63e018e Prevent segfault when receiving request in Hal-Bt
* 75bf441 hal-bt-data: ignore devices with no UUIDs
* a20f6e4 Free afb call sync json returned object in Hal-Bt
* b112013 Improve Hal-Bt print messages
* c2c29ef Improve Hal-Bt plugin A2DP bt devices detection
* 50ae4e9 HalBt plugin keeps list of connected A2DP devices
* 57f4078 Use correct file to include controller
* e6472ad Improve Hal-Bt plugin event catcher behaviour
* 4ce9b2a Prevent Hal-Bt plugin from crashing 4A
* 342913c Correct an error in Hal-Bt when calling 'mixer'
* 509f6b1 hal-4a-rcar-m3-bt.json: removed the plugin search path
* 43820da hal-bt! display error messages of sync calls
* 43577d8 Update version of conf.d/app-templates submodule.
* 05238f6 Update version of afb-helpers submodule.
* 916b0f5 Implement link with softmixer in hal-bt plugin
* fae4cf3 Get hal data in hal-bt plugin
* 6ea2ba2 Test afb require result at hal-bt plugin load
* 8f3ead9 Add handling of hci and profile in hal-bt plugin
* 5fceccb Fix little mistakes/typo in hal bluetooth plugin
* 3524254 Force hals init before ending hal-manager init
* 5446354 Decrease level of a msg printed in event catcher

4a-softmixer:
* b678f39 config.cmake: bump the needed version of alsalib to 1.1.6

Bug-AGL: SPEC-1679

Change-Id: I8eb5efb404c531339ba5668a1bf131368a233b8f
Signed-off-by: Jonathan Aillet <jonathan.aillet@iot.bzh>