raw/ioat: fix work-queue config size

raw/ioat: fix work-queue config size

According to latest DSA spec[1], the work-queue config register size
should be based off a value read from the WQ capabilities register.
Update driver to read this value and base the start of each WQ config
off that value.

[1] https://software.intel.com/content/www/us/en/develop/download/intel-data-streaming-accelerator-preliminary-architecture-specification.html

Fixes: ff06fa2cf3ba ("raw/ioat: probe idxd PCI")

Signed-off-by: Bruce Richardson <bruce.richardson@intel.com>
Tested-by: Kevin Laatz <kevin.laatz@intel.com>