rasdaemon: Add support for the CXL poison events

rasdaemon: Add support for the CXL poison events

Add support to log and record the CXL poison events.

The corresponding Kernel patches here:
https://lore.kernel.org/linux-cxl/64457d30bae07_2028294ac@dwillia2-xfh.jf.intel.com.notmuch/

Presently for logging only, could be extended for the policy
based recovery action for the frequent poison events depending on the above
kernel patches.

Signed-off-by: Shiju Jose <shiju.jose@huawei.com>
Reviewed-by: Jonathan Cameron <Jonathan.Cameron@huawei.com>
Signed-off-by: Mauro Carvalho Chehab <mchehab@kernel.org>