soundtrigger: fill in default extras from dsp

Squash of:

Author: Roman Birg <roman@cyngn.com>
Date:   Tue May 3 11:54:28 2016 -0700
    soundtrigger: fill in default extras from dsp
    We seem to get an improper offset when getting the value from the DSP
    (offset 100, data size 1), when this happens, return a new phrase event
    with valid extras which are initialized to some default values.
    Change-Id: Ie041f78fec6bdbcd82286b54a7b7fb0c98c740f5
Signed-off-by: Roman Birg <roman@cyngn.com>

Author: Sam Mortimer <sam@mortimer.me.uk>
Date:   Fri Dec 9 13:36:25 2016 -0800
    soundtrigger: fix memory corruption
    Fixes hotword on angler.
    Change-Id: Ic15a617c0f79f03785feaddd2dfa6deb90842a06

Change-Id: Ie041f78fec6bdbcd82286b54a7b7fb0c98c740f5