EDAC/armada_xp: Fix some log messages

Fix spelling (s/Aramda/Armada/) in a log message and in a comment. While
at it, add a trailing '\n' in messages.

Signed-off-by: Christophe JAILLET <christophe.jaillet@wanadoo.fr>
Signed-off-by: Borislav Petkov <bp@suse.de>
Reviewed-by: Jan Luebbe <jlu@pengutronix.de>
Link: https://lkml.kernel.org/r/20200413041556.3514-1-christophe.jaillet@wanadoo.fr