ARM: dts: socfpga: Add Altera Arria10 OCRAM EDAC devicetree entry

Add the device tree entries needed to support the Altera On-Chip
RAM EDAC on the Arria10 chip.

Signed-off-by: Thor Thayer <tthayer@opensource.altera.com>
Signed-off-by: Dinh Nguyen <dinguyen@opensource.altera.com>