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Also, refine status register prettyprinting and unlocking of the whole family.

Corresponding to flashrom svn r1785.
Signed-off-by: Jason Harper <jharper@iseis.com>
Signed-off-by: Stefan Tauner <stefan.tauner@alumni.tuwien.ac.at>
Acked-by: Stefan Tauner <stefan.tauner@alumni.tuwien.ac.at>