MAINTAINERS: Make Mauro EDAC reviewer

Mauro hasn't really been maintaining EDAC for a long while now. Make him
a reviewer instead.

Signed-off-by: Borislav Petkov <bp@suse.de>
Acked-by: Mauro Carvalho Chehab <mchehab@kernel.org>
Link: https://lore.kernel.org/r/20220926180343.23346-1-bp@alien8.de