EDAC, xgene: Add missing SoC register bus error handling

EDAC, xgene: Add missing SoC register bus error handling

Add missing register bus error handling for APM X-Gene EDAC SoC and fix
a checking condition for CE error promoted to UE.

Signed-off-by: Loc Ho <lho@apm.com>
Cc: Arnd Bergmann <arnd@arndb.de>
Cc: devicetree@vger.kernel.org
Cc: linux-arm-kernel@lists.infradead.org
Cc: linux-edac <linux-edac@vger.kernel.org>
Cc: Mauro Carvalho Chehab <mchehab@osg.samsung.com>
Cc: patches@apm.com
Link: http://lkml.kernel.org/r/1453495625-28006-3-git-send-email-lho@apm.com
Signed-off-by: Borislav Petkov <bp@suse.de>