arm64: dts: broadcom: ns2-svk: Use non-deprecated at25 properties

The at25,* properties have been deprecated since 2012. This board wasn't
upstream until 2014, so it should be safe to switch over to the "new"
properties.

Signed-off-by: Rob Herring (Arm) <robh@kernel.org>
Link: https://lore.kernel.org/r/20260106-dt-dtbs-broadcom-fixes-v1-9-ba45874e4553@kernel.org
Signed-off-by: Florian Fainelli <florian.fainelli@broadcom.com>

Author: robherring

arch/arm64/boot/dts/broadcom/northstar2/ns2-svk.dts

@@ -115,9 +115,9 @@
 		compatible = "atmel,at25";
 		reg = <0>;
 		spi-max-frequency = <5000000>;
-		at25,byte-len = <0x8000>;
-		at25,addr-mode = <2>;
-		at25,page-size = <64>;
+		size = <0x8000>;
+		address-width = <16>;
+		pagesize = <64>;
 		spi-cpha;
 		spi-cpol;
 		pl022,interface = <0>;