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Detect and temporarily disable the IMC while accessing the flash.
Disable writes on default, but allow the user to enforce it.

Corresponding to flashrom svn r1704.
Signed-off-by: Rudolf Marek <r.marek@assembler.cz>
Signed-off-by: Stefan Tauner <stefan.tauner@alumni.tuwien.ac.at>
Acked-by: Stefan Tauner <stefan.tauner@alumni.tuwien.ac.at>
Acked-by: David Hendricks <dhendrix@google.com>