4a-hal-generic: Bump to latest version

4a-hal-generic: Bump to latest version

* 81766dc Fix spelling in README.md
* 51bb228 Improve hal list response from hal-manager
* 2dfd4dd Remove boolean library
* 38dcf50 Free json objects that should have been freed
* 00a7499 Correct handling of incomming json messages
* 9e0c0cf Authorize launching 4a-hal with no config file
* 440cb8a Correct the request return when calling a stream
* c422421 Delay event parsing to be the last
* c42b631 Optimize alsacore event handler
* 592480d Update Kingfisher json configuration files

Bug-AGL: SPEC-1405

Change-Id: Ide6e0e7ac7b6473ef44d674eb445352ab13097b6
Signed-off-by: Jonathan Aillet <jonathan.aillet@iot.bzh>