cxl/mem: Use dev instead of pdev->dev

Trivial cleanup.

Signed-off-by: Ben Widawsky <ben.widawsky@intel.com>
Acked-by: Jonathan Cameron <Jonathan.Cameron@huawei.com>
Link: https://lore.kernel.org/r/20210407222625.320177-2-ben.widawsky@intel.com


Signed-off-by: Dan Williams <dan.j.williams@intel.com>