rasdaemon: cxl: Update common event to CXL spec rev 3.1

rasdaemon: cxl: Update common event to CXL spec rev 3.1

CXL spec 3.1 section 8.2.9.2.1 Table 8-42, Common Event Record format has
updated with Maintenance Operation Subclass information.

Add updates in rasdaemon CXL event handler for the above spec change
and for the corresponding changes in kernel CXL common trace event
implementation.

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