Do not clobber the udev rules dir

Signed-off-by: Davide Cavalca <[email protected]>

update-m1n1: read mitigations option

Mitigations option was recently added to m1n1. This change allows the update-m1n1 script to read it. Currently, it only reads chosen and display options.

Signed-off-by: Mark <[email protected]>

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