amd64_edac: Improve DRAM address mapping

Drop static tables which map the bits in F2x80 to a chip select size in
favor of functions doing the mapping with some bit fiddling. Also, add
F15 support.

Signed-off-by: Borislav Petkov <borislav.petkov@amd.com>

diff --cc drivers/edac/amd64_edac.c
Simple merge

diff --cc drivers/edac/amd64_edac.h
Simple merge