ARM: dts: microchip: sam9x60ek: rename spi-cs-setup-ns property to spi-cs-setup-delay-ns

The naming scheme for delay properties includes "delay" in the name,
so renaming spi-cs-setup-ns property to spi-cs-setup-delay-ns.

Fixes: 2c0a1fa ("ARM: dts: at91: sam9x60ek: Set sst26vf064b SPI NOR flash at its maximum frequency")
Signed-off-by: Manikandan Muralidharan <manikandan.m@microchip.com>
Reviewed-by: Alexander Dahl <ada@thorsis.com>
Link: https://lore.kernel.org/r/20250521054309.361894-1-manikandan.m@microchip.com
Signed-off-by: Claudiu Beznea <claudiu.beznea@tuxon.dev>

Author: manikandan-m11

arch/arm/boot/dts/microchip/at91-sam9x60ek.dts

@@ -609,7 +609,7 @@
 		compatible = "jedec,spi-nor";
 		reg = <0>;
 		spi-max-frequency = <104000000>;
-		spi-cs-setup-ns = <7>;
+		spi-cs-setup-delay-ns = <7>;
 		spi-tx-bus-width = <4>;
 		spi-rx-bus-width = <4>;
 		m25p,fast-read;