Add a private data structure for Arria10 L2 cache ECC and the probe
function for it.

The Arria10 ECC device IRQs are in a shared register so the ECC Manager
parent/child relationship requires a different probe function.
Signed-off-by: NThor Thayer <tthayer@opensource.altera.com>
Cc: devicetree@vger.kernel.org
Cc: dinguyen@opensource.altera.com
Cc: linux-arm-kernel@lists.infradead.org
Cc: linux@arm.linux.org.uk
Cc: linux-edac <linux-edac@vger.kernel.org>
Link: http://lkml.kernel.org/r/1458576106-24505-8-git-send-email-tthayer@opensource.altera.comSigned-off-by: NBorislav Petkov <bp@suse.de>