UBUNTU: SAUCE: cxlflash: Hardware AFU for OCXL

UBUNTU: SAUCE: cxlflash: Hardware AFU for OCXL

BugLink: http://bugs.launchpad.net/bugs/1752672
When an adapter is initialized, transport specific configuration and MMIO
mapping details need to be saved. For CXL, this data is managed by the
underlying kernel module. To maintain a separation between the cxlflash
core and underlying transports, introduce a new structure to store data
specific to the OCXL AFU.

Initially only the pointers to underlying PCI and generic devices are
added to this new structure - it will be expanded further in future
commits. Services to create and destroy this hardware AFU are added and
integrated in the probe and exit paths of the driver.

Signed-off-by: Uma Krishnan <ukrishn@linux.vnet.ibm.com>
Acked-by: Matthew R. Ochs <mrochs@linux.vnet.ibm.com>
Signed-off-by: Seth Forshee <seth.forshee@canonical.com>