EDAC, mce_amd_inj: Add an injector function

Selectively inject either a real MCE or a sw-only version which
exercises the decoding path only. The hardware-injected MCE triggers a
machine check exception (#MC) so that the MCE handler can be bothered to
do something too.

Signed-off-by: Borislav Petkov <bp@suse.de>

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