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Also, correct prettyprinting of the registers of the various families,
and abort if SpiAccessMacRomEn or SpiHostAccessRomEn prohibit full access.

Tested reading/writing on ASRock IMB-A180, and chipset detection on
one of each affected generation by Chris Goodrich from Sage.

Corresponding to flashrom svn r1741.
Signed-off-by: Stefan Tauner <stefan.tauner@alumni.tuwien.ac.at>
Acked-by: Carl-Daniel Hailfinger <c-d.hailfinger.devel.2006@gmx.net>