Add back in the ability for pmap_mapdev() to use KVM if the region being requested is outside of the range of the direct map region.  eg: for pci windows.  While here, increase the minimum size of the direct map region to be 4GB instead of 1GB.
Add back in the ability for pmap_mapdev() to use KVM if the region
being requested is outside of the range of the direct map region.  eg:
for pci windows.  While here, increase the minimum size of the direct
map region to be 4GB instead of 1GB.

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