util/nvmutil: double-verify r/w using tmp files

we now read twice, verify the two, to make sure
one read isn't faulty

we operate on a tmp file, then rename back. this
reduces the risk of power cuts corrupting data

we properly verify the contents that we wrote
back

inspired largely by flashprog. i wanted to have
an insanely over-engineered and extremely safe
tool that edits intel gbe nvm files

and now i have one. the only one in existence.

i'm basically writing my own libc code at this
point, to be honest. i'll probably start puttting
these functions in libraries

e.g. that tmpfile generator

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

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