configs/mx6udoo: Add initial support

configs/mx6udoo: Add initial support

Add the initial support for mx6q/dl udoo boards.

For information about these boards, please visit:
http://www.udoo.org/

In linux.fragment we disable USB support for now because kernel 4.8
hangs on udoo board.

This is been addressed by Peter Chen's kernel patch series that provides
a standard way to reset a USB hub.

When such series hit mainline, then we can bump the kernel and remove
linux.fragment.

Signed-off-by: Fabio Estevam <festevam@gmail.com>
Signed-off-by: Thomas Petazzoni <thomas.petazzoni@free-electrons.com>