EDAC/i82443bxgx: Remove driver that has been marked broken since 2007

EDAC/i82443bxgx: Remove driver that has been marked broken since 2007

The history of this driver is pretty amusing. It was marked broken in
2007 in

  28f96eeafc89 ("drivers/edac-new-i82443bxgz-mc-driver: mark as broken").

It was then fixed in 2008 in

  53a2fe5804e8 ("edac: make i82443bxgx_edac coexist with intel_agp"),

but the dependency on BROKEN was never removed. Given that this was never
fixed in the last ~18 years, it is obvious there is no demand for this driver.
Remove it and move the former maintainer to the CREDITS file.

Signed-off-by: Ethan Nelson-Moore <enelsonmoore@gmail.com>
Signed-off-by: Borislav Petkov (AMD) <bp@alien8.de>
Link: https://patch.msgid.link/20260129082937.48740-1-enelsonmoore@gmail.com