Documentation, EDAC: Update xgene binding for missing register bus

Documentation, EDAC: Update xgene binding for missing register bus

Update the APM X-Gene SoC EDAC documentation binding to reference the
missing register bus for the SoC EDAC.

Signed-off-by: Loc Ho <lho@apm.com>
Cc: Arnd Bergmann <arnd@arndb.de>
Cc: devicetree@vger.kernel.org
Cc: Ian Campbell <ijc+devicetree@hellion.org.uk>
Cc: Kumar Gala <galak@codeaurora.org>
Cc: linux-arm-kernel@lists.infradead.org
Cc: linux-edac <linux-edac@vger.kernel.org>
Cc: Mark Rutland <mark.rutland@arm.com>
Cc: mchehab@osg.samsung.com
Cc: patches@apm.com
Cc: Pawel Moll <pawel.moll@arm.com>
Cc: Rob Herring <robh+dt@kernel.org>
Link: http://lkml.kernel.org/r/1453495625-28006-2-git-send-email-lho@apm.com
Signed-off-by: Borislav Petkov <bp@suse.de>