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

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

Commit 83a3ced797256d ("rasdaemon: Add support for vendor-specific
machine check error information") assumes that MCA_CONFIG MSR will be
exported as part of vendor-specific error information through the MCE
tracepoint.

The same, however, is not true anymore. MCA_CONFIG MSR will not be
exported through the MCE tracepoint. Instead, the data from MCA_SYND1/2
MSRs, exported as vendor-specific error information on newer AMD SOCs,
should always be interpreted as FRUText.

Modify the error decoding support accordingly.

Fixes: 83a3ced797256d ("rasdaemon: Add support for vendor-specific
machine check error information")
Signed-off-by: Avadhut Naik <avadhut.naik@amd.com>
Signed-off-by: Mauro Carvalho Chehab <mchehab+huawei@kernel.org>