ichspi.c: improve macros for SSFS and SSFC bits

 - introduce offset macros and use them to (re)define the existing mask macros
 - fix masks of SSFC_COP, SSFC_DBC, SSFC_SCF (were single-bit masks erroneously)
 - add comments
 - rename SSFS_CDS to SSFS_FDONE (abbr. used in datasheet; not in SSFS but HSFS)
 - use those for refactoring and magic number elemination.

 following patch uses them for pretty printing.

Corresponding to flashrom svn r1328.

Signed-off-by: Stefan Tauner <stefan.tauner@alumni.tuwien.ac.at>
Acked-by: Carl-Daniel Hailfinger <c-d.hailfinger.devel.2006@gmx.net>
1 file changed