ARM: dts: socfpga: Fix SDRAM node address for Arria10

The address in the SDRAM node was incorrect. Fix this to agree with the
correct address and to match the reg definition block.

Cc: stable@vger.kernel.org
Fixes: 54b4a8f5("arm: socfpga: dts: Add Arria10 SDRAM EDAC DTS support")
Signed-off-by: Thor Thayer <thor.thayer@linux.intel.com>
Signed-off-by: Dinh Nguyen <dinguyen@kernel.org>