skx_common: use driver decoder when possible

Bugzilla: https://bugzilla.redhat.com/show_bug.cgi?id=2124913
Tested: by me, sanity

This patchset backports support for decoding errors in the driver when
possible instead of using BIOS, which improves the performance. As
production systems might see storms of corrected errors in thousands per
second, this can be very useful. Code will fall back to BIOS when driver
decoding is not possible.

Signed-off-by: Aristeu Rozanski arozansk@redhat.com