As suggested by Sascha, here we setup all the pins that we are using in
the current (and currently reviewed) drivers for mx31moboard system.

changes since v1: changed I2C1 pin names
Signed-off-by: Valentin Longchamp <valentin.longchamp@epfl.ch>
Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de>