nanobsd: Expose do_image_prep on command lineHEADmain

do_image_prep will skip the customizations and other image prep that's
the same each time. It was just set before for -I. Expose it now with -p
which doesn't have the other side effects. Also, fix a bug where early
customization was run in this case. We don't want that run multiple
times when building an image from an existing tree or when skipping
image prep (there's no reason to make it a separate hook). Also change
example small media from Compact Flash to SD Card (though maybe it
should be microSD card, eMMC or similar, but that's getting too
verbose).

Sponsored by:		Netflix

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