scripts: runner: dfu-util: add --dfuse-modifiers option
scripts: runner: dfu-util: add --dfuse-modifiers option

This gives callers finer-grained control over the flash. For example,
giving --dfuse-modifiers=force:mass-erase allows a chip-erase rather
than just erasing the sectors which need to be overwritten with the image.

Signed-off-by: Marti Bolivar <fd5da480b758a78208111e6ae5c6806e1f887137@opensourcefoundries.com>

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