Add a new field for the names of programmers and use it to match against user input

Use programmer.name to match the --programmer parameter instead of
hardcoding the name of every single programmer in main().

-p dummyfoo won't be mistaken for -p dummy anymore.

Corresponding to flashrom svn r680.

Signed-off-by: Carl-Daniel Hailfinger <c-d.hailfinger.devel.2006@gmx.net>
Acked-by: Stefan Reinauer <stepan@coresystems.de>

flash.h

@@ -88,6 +88,7 @@ enum programmer {
 	PROGRAMMER_IT87SPI,
 	PROGRAMMER_FT2232SPI,
 	PROGRAMMER_SERPROG,
+	PROGRAMMER_INVALID /* This must always be the last entry. */
 };
 
 extern enum programmer programmer;