rasdaemon: Add support for vendor-specific machine check error information

rasdaemon: Add support for vendor-specific machine check error information

Some CPU vendors may provide additional vendor-specific machine check
error information. AMD, for example, provides FRU Text through SYND 1/2
registers if BIT 9 of SMCA_CONFIG register is set.

Add support to display the additional vendor-specific error information,
if any.

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