4a-hal-generic: bump revision (inc. first rev for RPI3 HAL)

4a-hal-generic: bump revision (inc. first rev for RPI3 HAL)

This patch introduces the following changes on 4a-hal-generic:
* e949092 hal-4a-raspberry-pi-3: add a WARNING related to RPI3 sound driver bug
* 01d3370 Correct 'volume' control in Minnowboard hal
* 7fea639 Add Raspberry Pi 3 HAL
* 2ce8a00 Correct error print when attaching to mixer
* c05faaf Update version of conf.d/app-templates submodule.
* 744af17 Update version of app-controller submodule.
* 39fda4b Update version of afb-helpers submodule.
* 492caab Remove trailing white spaces in radio config file
* 2ef5026 Added a radio to 2 channels playback .json example

Note that due to a bug in RPI3 sound card driver, no sound is produced
on RPI3 with internal card. 4A works on other devices (USB for example).

Bug-AGL: SPEC-1610

Change-Id: I14c581269945306e205808b53f9d5c7f60f8af88
Signed-off-by: Stephane Desneux <stephane.desneux@iot.bzh>