rasdaemon: Add error decoding for MCA_CTL_SMU extended bits

[nchatrad]

Enable error decoding support for the newly added extended error bit descriptions from MCA_CTL_SMU. b'0:11 can be decoded from existing array smca_smu2_mce_desc. Define a function to append the newly defined b'58:62 to the smca_smu2_mce_desc. This reduces the maintaining Reserved bits from b'12:57 in the code.