arm64: dts: qcom: sm8150: drop snps,dw-pcie fallback compatible

Qualcomm PCI express root complex does not use snps,dw-pcie fallback:

  ['qcom,pcie-sm8150', 'snps,dw-pcie'] is too long
Reviewed-by: Konrad Dybcio <konrad.dybcio@linaro.org>
Signed-off-by: Krzysztof Kozlowski <krzysztof.kozlowski@linaro.org>
Signed-off-by: Bjorn Andersson <andersson@kernel.org>
Link: https://lore.kernel.org/r/20230417080939.28648-2-krzysztof.kozlowski@linaro.org

arch/arm64/boot/dts/qcom/sm8150.dtsi

@@ -1814,7 +1814,7 @@ dma@10a2000 {
 		};
 
 		pcie0: pci@1c00000 {
-			compatible = "qcom,pcie-sm8150", "snps,dw-pcie";
+			compatible = "qcom,pcie-sm8150";
 			reg = <0 0x01c00000 0 0x3000>,
 			      <0 0x60000000 0 0xf1d>,
 			      <0 0x60000f20 0 0xa8>,
@@ -1909,7 +1909,7 @@ pcie0_lane: phy@1c06200 {
 		};
 
 		pcie1: pci@1c08000 {
-			compatible = "qcom,pcie-sm8150", "snps,dw-pcie";
+			compatible = "qcom,pcie-sm8150";
 			reg = <0 0x01c08000 0 0x3000>,
 			      <0 0x40000000 0 0xf1d>,
 			      <0 0x40000f20 0 0xa8>,