x86/intel_minnow_max.c: add board gpio count
x86/intel_minnow_max.c: add board gpio count

Whilst this value is not used because it's only required by the aio module it
is interesting to have this information if we want to expose it to the user

Signed-off-by: Brendan Le Foll <3e0e8c4069934e8b47d99704927a85c66c0ceb33@intel.com>

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