linux-cfa: bump to 3.10.25

This also fixes the git branch reference.

Signed-off-by: Alexandre Belloni <alexandre.belloni@free-electrons.com>
linux-cfa: fine tune kernel configuration

Remove sound support as there is no sound on the boards.
Remove useless Logitech DJ module
Fine tune the debugging option to remove a lot of debugging messages
(input events, USB, lockdep).

Signed-off-by: Alexandre Belloni <alexandre.belloni@free-electrons.com>
linux-cfa: split recipe to create an include file

Signed-off-by: Alexandre Belloni <alexandre.belloni@free-electrons.com>
linux-cfa: Add a recipe for 3.12

Currently, it is based on 3.12.6. Keeping v3.10 as it is the current
LTS.

Signed-off-by: Alexandre Belloni <alexandre.belloni@free-electrons.com>