arm64: dts: broadcom: northstar2: Drop QSPI "clock-names"

The "clock-names" property is not documented for the "brcm,spi-bcm-qspi"
binding nor in use by the kernel driver, so drop it.

Signed-off-by: Rob Herring (Arm) <robh@kernel.org>
Link: https://lore.kernel.org/r/20260106-dt-dtbs-broadcom-fixes-v1-12-ba45874e4553@kernel.org
Signed-off-by: Florian Fainelli <florian.fainelli@broadcom.com>

Author: robherring

arch/arm64/boot/dts/broadcom/northstar2/ns2.dtsi

@@ -813,7 +813,6 @@
 			interrupts = <GIC_SPI 419 IRQ_TYPE_LEVEL_HIGH>;
 			interrupt-names = "spi_l1_intr";
 			clocks = <&iprocmed>;
-			clock-names = "iprocmed";
 			num-cs = <2>;
 			#address-cells = <1>;
 			#size-cells = <0>;