ARM: dts: at91: sama5d2: add isc node

Add isc node, it conflicts with pdmic and uart3.

Signed-off-by: Songjun Wu <songjun.wu@microchip.com>
[claudiu.beznea@microchip.com: place isc node after hlcdc node]
Signed-off-by: Claudiu Beznea <claudiu.beznea@microchip.com>
Acked-by: Nicolas Ferre <nicolas.ferre@microchip.com>
Acked-by: Ludovic Desroches <ludovic.desroches@microchip.com>
Signed-off-by: Alexandre Belloni <alexandre.belloni@free-electrons.com>