arm64: dts: qcom: sdm845: drop unused slimbus dmas

Bindings document only two DMA channels.  Linux driver also does not use
remaining rx2/tx2.
Signed-off-by: Krzysztof Kozlowski <krzysztof.kozlowski@linaro.org>
Tested-by: Steev Klimaszewski <steev@kali.org>
Signed-off-by: Bjorn Andersson <andersson@kernel.org>
Link: https://lore.kernel.org/r/20220928152027.489543-6-krzysztof.kozlowski@linaro.org

arch/arm64/boot/dts/qcom/sdm845.dtsi

@@ -3828,9 +3828,8 @@ slim: slim@171c0000 {
 			reg = <0 0x171c0000 0 0x2c000>;
 			interrupts = <GIC_SPI 163 IRQ_TYPE_LEVEL_HIGH>;
 
-			dmas = <&slimbam 3>, <&slimbam 4>,
-				<&slimbam 5>, <&slimbam 6>;
-			dma-names = "rx", "tx", "tx2", "rx2";
+			dmas = <&slimbam 3>, <&slimbam 4>;
+			dma-names = "rx", "tx";
 
 			iommus = <&apps_smmu 0x1806 0x0>;
 			#address-cells = <1>;