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We forgot to add a few SPI erase functions to the helper function that is
used for SFDP. Also, sort the declarations in the header.

Corresponding to flashrom svn r1672.
Signed-off-by: Stefan Tauner <stefan.tauner@alumni.tuwien.ac.at>
Acked-by: Stefan Tauner <stefan.tauner@alumni.tuwien.ac.at>