4a-hal: Cleanup and 'haldependencies' feature

Description

Cleanup 4a-hal repository.

Add 'haldependencies' functionnality :
'haldependencies' is a new section of hal configuration file. This new section will be used to probe for multiple audio device using only one hal. Each probed device could be 'mandatory', 'dynamic' (optional but periodically probed), or 'static' (optional and probed only at startup). The result of handling this section will be used by softmixer and
in 'halmap' section.

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Walt Miner 
July 9, 2019 at 4:53 PM

Close for HH RC2

Jonathan Aillet 
May 28, 2019 at 12:55 PM

Not ready to be closed yet.
Ongoing developments about 'haldependencies' are still needed for this feature.

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Created April 19, 2019 at 9:06 AM
Updated September 19, 2019 at 12:06 PM
Resolved June 27, 2019 at 2:31 PM