EDAC, altera: Rename MC trigger to common name

Rename the Memory Controller debug trigger to the same common name as
the EDAC devices.

Signed-off-by: Thor Thayer <tthayer@opensource.altera.com>
Cc: linux-edac <linux-edac@vger.kernel.org>
Link: http://lkml.kernel.org/r/1471622666-15197-3-git-send-email-tthayer@opensource.altera.com


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