Get rid of the athome libusb variety

We don't need it (for now?) and it's conflicting with the one we
do use

Change-Id: I1658be17e9629b2a388f50400925ddbb0d8420db
Add kissfft repo for WebAudio

Change-Id: I2c4369c3cc490289b9d31ffa35a7e8076a0d7a3f