cxl/memdev: Remove unused cxlmd field

This field was left over when the connection between the cxl_memdev and
cxl_mem was tighter.  It is no longer set nor used so remove it.[1]

Link: https://lore.kernel.org/r/CAPcyv4hcgh2gb8qsS_UXTBSGqYfMPnC6p5kkvNUjm+V6kVKM5g@mail.gmail.com/

Suggested-by: Jonathan.Cameron@huawei.com
Signed-off-by: Ira Weiny <ira.weiny@intel.com>
Link: https://lore.kernel.org/r/20211103234857.3689354-1-ira.weiny@intel.com
Signed-off-by: Dan Williams <dan.j.williams@intel.com>

drivers/cxl/cxlmem.h

@@ -97,7 +97,6 @@ struct cxl_mbox_cmd {
  * Currently only memory devices are represented.
  *
  * @dev: The device associated with this CXL state
- * @cxlmd: Logical memory device chardev / interface
  * @regs: Parsed register blocks
  * @payload_size: Size of space for payload
  *                (CXL 2.0 8.2.8.4.3 Mailbox Capabilities Register)
@@ -124,7 +123,6 @@ struct cxl_mbox_cmd {
  */
 struct cxl_dev_state {
 	struct device *dev;
-	struct cxl_memdev *cxlmd;
 
 	struct cxl_regs regs;