UBUNTU: SAUCE: cxlflash: Setup LISNs for user contexts

UBUNTU: SAUCE: cxlflash: Setup LISNs for user contexts

BugLink: http://bugs.launchpad.net/bugs/1752672
The SISLite specification has been updated for OCXL to support
communicating data to generate AFU interrupts to the AFU. This includes
a new capability bit that is advertised for OCXL AFUs and new registers
to hold the object handle and translation PASID of each interrupt. For
Power, the object handle is the mapped trigger page. Note that because
these mappings are kernel only, the PASID of a kernel context must be
used to satisfy the translation.

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>