arm64: dts: Updated NAND DT properties for NS2 SVK

This patch adds NAND DT properties for NS2 SVK to configure the bus
width width and OOB sector size

Signed-off-by: Prafulla Kota <prafulla.kota@broadcom.com>
Signed-off-by: Ray Jui <ray.jui@broadcom.com>
Signed-off-by: Florian Fainelli <f.fainelli@gmail.com>