rasdaemon: ras-mc-ctl: Add support to display mcastatus_msg string

rasdaemon: ras-mc-ctl: Add support to display mcastatus_msg string

Currently, the mcastatus_msg string of struct mce_event is added to the
SQLite database by the rasdaemon when it is recording errors. The same
however, is not outputted by the ras-mc-ctl utility.

The string provides important error information relating to the received
MCE. For example, on AMD SMCA systems, the string outputs extended error
code and description. As such, the string should be present in the
output of ras-mc-ctl utility.

Add support to output the string through the ras-mc-ctl utility.

Signed-off-by: Avadhut Naik <avadhut.naik@amd.com>
Signed-off-by: Mauro Carvalho Chehab <mchehab+huawei@kernel.org>