EDAC/xgene: Fix typo processsors -> processors

Spelling mistake (triple letters) in comment. Detected with the help of
Coccinelle.

Signed-off-by: Julia Lawall <Julia.Lawall@inria.fr>
Signed-off-by: Borislav Petkov <bp@suse.de>
Link: https://lore.kernel.org/r/20220521111145.81697-39-Julia.Lawall@inria.fr