ARM: dts: Move Arria10 SDRAM as child of ECC Manager

Changes to support ECC Manager as SDRAM IRQ parent by
1) updating IRQ property values to correct child IRQs
2) moving node under ECC Manager.

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