tenderloin: Build ath6kl into kernel

Change-Id: Ib548ca753a13a3871aa8546dbecc49d9498d746f
death to all modules!

* we're building everything we need into the kernel now, actually
  disabling module loading altogether
* remove all references to modules as they don't make sense now anyway
Don't set ro.secure=0 by default

Some people my get mad at me, but this is a bigtime security risk.
Do you really want anyone that can plug a usb cable into your tablet
to have root access automatically?