x86/intel_minnow_max.c: Adjust gpio pins based on kernel version

x86/intel_minnow_max.c: Adjust gpio pins based on kernel version

This should adjust the pinouts, at runtime, based on the current
kernel that's in use.  The Linux kernel made a change between
3.17 and 3.18 ( specifically ea584595fc85e65796335033dfca25ed655cd0ed )
that changed the numbering for GPIOs.  This obviously breaks everything
for mraa on the MinnowBoard MAX if you have a 3.18 or newer kernel.

Signed-off-by: John 'Warthog9' Hawley <john.hawley@intel.com>
Signed-off-by: Brendan Le Foll <brendan.le.foll@intel.com>