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The linux_spi driver is now enabled by default on Linux.
A man page entry and a line in --list-supported output have been added.

Corresponding to flashrom svn r1498.
Signed-off-by: Carl-Daniel Hailfinger <c-d.hailfinger.devel.2006@gmx.net>
Acked-by: Stefan Tauner <stefan.tauner@alumni.tuwien.ac.at>