galileo: Shrink pinmux array
galileo: Shrink pinmux array

The pins array in galileo-gen2-pinmux.c:galileo_brd_to_cpu_gpio_pin is
unnecessarily large.  This patch reduces its size.

arurke/contiki,MohamedSeliem/contiki,MohamedSeliem/contiki,arurke/contiki,MohamedSeliem/contiki,arurke/contiki,MohamedSeliem/contiki,arurke/contiki,arurke/contiki,MohamedSeliem/contiki,arurke/contiki,MohamedSeliem/contiki,MohamedSeliem/contiki,arurke/contiki