x86, mce, severity: Fix two severities table signatures

The "Spurious not enabled" entry is redundant: the "Not enabled" entry
earlier in the table will cover this case.

The "Action required; unknown MCACOD" entry shouldn't specify MCACOD in
the .mask field. Current code will only match for mcacod==0 rather than
all AR=1 entries.

Signed-off-by: Tony Luck <tony.luck@intel.com>
Signed-off-by: Hidetoshi Seto <seto.hidetoshi@jp.fujitsu.com>
Link: http://lkml.kernel.org/r/4DEED5BC.8030703@jp.fujitsu.com
Signed-off-by: Borislav Petkov <borislav.petkov@amd.com>