intel_minnow_max.c: fixed pin capability errors

Signed-off-by: Henry Bruce <henry.bruce@intel.com>
Signed-off-by: Thomas Ingleby <thomas.c.ingleby@intel.com>
docs: Added first cut at minnow-max documentation

Signed-off-by: Henry Bruce <henry.bruce@intel.com>
Signed-off-by: Thomas Ingleby <thomas.c.ingleby@intel.com>
gpio.c: Added gpio list/set/get utility

Signed-off-by: Henry Bruce <henry.bruce@intel.com>
Signed-off-by: Thomas Ingleby <thomas.c.ingleby@intel.com>