EDAC/r82600: Remove this obsolete driver

EDAC/r82600: Remove this obsolete driver

This driver supports the Radisys 82600 embedded chipset, which was used with
Pentium III-era CPUs. It is highly unlikely that it is still used.  Besides
its own documentation, the only information I was able to find about the
R82600, after looking through many pages of Google results, was that it was
used in a Nokia 2G GSM base station.

The original author said:

"This was after Bluesmoke (watch was out-of-tree), and was pay of the first
set of in tree edac drivers (a fresh design as far as I remember).

This particular driver did apparently get used by Akamai quite heavily and
widely  but all ancient history now. The Radisys r82600 edac driver 
r82600_edac.c was closely related hardware from the same era, and can probably
go too (although being embedded hardware, it's possible its production
lifespan was considerably longer).

Tim."

Mail is

  https://lore.kernel.org/r/01BCCA37-F6A2-458B-BFE7-99C7724CDDEA@buttersideup.com

but lkml drops html mail so quoting the relevant info here too.

  [ bp: Massage and extend commit message. ]

Signed-off-by: Ethan Nelson-Moore <enelsonmoore@gmail.com>
Signed-off-by: Borislav Petkov (AMD) <bp@alien8.de>
Link: https://patch.msgid.link/20260130052633.13119-1-enelsonmoore@gmail.com