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All other chips call it wrprotect which is less confusing. As a side
benefit, flash_addr is now a name usable for other stuff.

Corresponding to flashrom svn r496.
Signed-off-by: Carl-Daniel Hailfinger <c-d.hailfinger.devel.2006@gmx.net>
Acked-by: Ronald G. Minnich <rminnich@gmail.com>