v1.1 allows finer grained tuning of the SSC (spread-spectrum-clocking)
settings for SAS and SATA.  See notes in probe_roms.h

v1.3 allows the attenuation of the attached cables to be specified to
the driver in terms of 'short', 'medium', and 'long' (see probe_roms.h).
These settings (per phy) are retrieved from the platform oem-parameters
(BIOS rom), the fallback firmware blob, or via a module parameter
override.

Signed-off-by: Dan Williams <dan.j.williams@intel.com>
Signed-off-by: Ben Hutchings <ben@decadent.org.uk>