ARM: MX3: add skeleton for lilly-1131 development board

Support code for lilly-1131 is implemented in a module/baseboard
fashion. All code specific to peripherals found on the development board
will go to this file.

Signed-off-by: Daniel Mack <daniel@caiaq.de>
Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de>