Integrate I2C driver into board initializzation
Integrate I2C driver into board initializzation

This patch add I2C initializzation for board with I2C devices.
Signed-off-by: Maria Laura Stefanizzi <3f2da5ee2a1f473d5d287f1b5e29ae5d61956c87@gmail.com>

MohamedSeliem/contiki,bluerover/6lbr,bluerover/6lbr,bluerover/6lbr,bluerover/6lbr,MohamedSeliem/contiki,MohamedSeliem/contiki,MohamedSeliem/contiki,MohamedSeliem/contiki,arurke/contiki,arurke/contiki,arurke/contiki,arurke/contiki,arurke/contiki,bluerover/6lbr,MohamedSeliem/contiki,bluerover/6lbr,arurke/contiki,MohamedSeliem/contiki,bluerover/6lbr,arurke/contiki