loongarch: dts: remove non-existent DAC from 2k1000-ref

The 2k1000 reference boards do not have a Rohm DAC on them as far as I
can tell, and they certainly do not have a dh2228fv, as this device does
not actually exist! Remove the dac nodes from the devicetrees as it is
not acceptable to pretend to have a device on a board in order to bind
the spidev driver in Linux.

Signed-off-by: Conor Dooley <conor.dooley@microchip.com>
Reviewed-by: Krzysztof Kozlowski <krzysztof.kozlowski@linaro.org>
Link: https://lore.kernel.org/r/20240717-preacher-sandal-2aeffa322b9f@spud
Signed-off-by: Krzysztof Kozlowski <krzysztof.kozlowski@linaro.org>

Author: ConchuOD

arch/loongarch/boot/dts/loongson-2k1000-ref.dts

@@ -90,11 +90,6 @@
 
 	#address-cells = <1>;
 	#size-cells = <0>;
-	spidev@0 {
-		compatible = "rohm,dh2228fv";
-		spi-max-frequency = <100000000>;
-		reg = <0>;
-	};
 };
 
 &ehci0 {