linux: Add a Linux 3.6 kernel recipe
linux: Add a Linux 3.6 kernel recipe

* Add a recipe to build the linux kernel from the rpi-3.6.y branch at
  https://github.com/raspberrypi/linux
* Since this has a higher version, it will be the preferred linux kernel
  by default.

Signed-off-by: Jan Schmidt <def0dbdcd55cbd155ceb01f88cf85ce025345ce8@noraisin.net>
Signed-off-by: Andrei Gherzan <8dc7c09356db0b1762fb140617d7375c0a5a4131@gherzan.ro>

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