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In C++ "class" is a reserved keyword, and as we'll want to use libflashrom
from C++ code at some point, let's make sure it doesn't cause issues.
Other places in the code already used "devclass" anyway, so it also increases
consistency and readability a bit.

Corresponding to flashrom svn r1371.
Signed-off-by: Uwe Hermann <uwe@hermann-uwe.de>
Acked-by: Uwe Hermann <uwe@hermann-uwe.de>