HNVRAM variable GPN is not stored in binary format

By convention, a small set of HNVRAM variables are printed in hex. The
variable GPN was historically part of this set on older Broadcom
platforms, but those historical reasons don't apply to newer platforms
like Optimus.

Change-Id: I1d3c96236829d2bed6e22c745a9ab6312f7c71c8
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