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The help implied that writes happen by default, which they don't. Fix
the text, and say something when we dont specify any commands.

Corresponding to flashrom svn r141 and coreboot v2 svn r2820.

Signed-off-by: Jordan Crouse <jordan.crouse@amd.com>    
Acked-by: Stefan Reinauer <stepan@coresystems.de>