nfit: Account for table size length variation

nfit: Account for table size length variation

Orabug: 22913653

The size of NFIT tables don't necessarily match the size of the
data structures that we use for them.  For example, the NVDIMM
Control Region Structure table is shorter for a device with
no block control windows than for a device with block control windows.
Other tables, such as Flush Hint Address Structure and the Interleave
Structure are variable length by definition.

Account for the size difference when comparing table entries by
using the actual table size from the table header if it's less
than the structure size.

Signed-off-by: Linda Knippers <linda.knippers@hpe.com>
Acked-by: Vishal Verma <vishal.l.verma@intel.com>
Signed-off-by: Dan Williams <dan.j.williams@intel.com>
(cherry picked from commit 826c416f3c9493b69630a811832cfb7c9007f840)
Signed-off-by: Dan Duval <dan.duval@oracle.com>