util/nvmutil: remove /dev/random fallback

only use the old fallback, or /dev/urandom

/dev/random blocks on some older unix machines,
or in embedded environments that may never
have enough entropy, causing the code to hang.

urandom is most certainly expected to exist on
pretty much anything since the mid 90s.

i could probably re-add the arc4random setup
for BSDs. i'll think about it. gotta do that
portably too.

Signed-off-by: Leah Rowe <leah@libreboot.org>

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