util/nvmutil: limit rw size on specific commands

i previously had this as a speed optimisation, but
removed it because it wouldn't make any real speed
difference, on most modern file systems / kernels.

however, this also has the dual purpose of ensuring
only what was verified gets written, on operations
that only touch the NVM area, since this relies on
checksum verification.

therefore, i have re-added this feature, but under
the new design of nvmutil. it is done policy-based,
instead of having if/else for specific commands.

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

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