util/nvmutil: use new fs_open functions for gbe

this unifies nvmutil's file handling with the
handling used by mkhtemp. a special function
has been written for this. this allows greater
flexibility since we can more easily check the
integrity of a file at inode/dev level; this
complements nvmutil's existing content-based
verification.

(this also fixes nvmutil, so that gbe files can
be changed again. mkhtemp broke it while i was
writing it, but now everything works again)

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

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