arm64: dts: msm8998: add MSM8998 specific compatible

Add new compatible for MSM8998 (compatible with MSM8996) to allow
further customizing if needed and to accurately describe the hardware.
Signed-off-by: Krzysztof Kozlowski <krzysztof.kozlowski@linaro.org>
Reviewed-by: Konrad Dybcio <konrad.dybcio@linaro.org>
Signed-off-by: Bjorn Andersson <andersson@kernel.org>
Link: https://lore.kernel.org/r/20221115125310.184012-3-krzysztof.kozlowski@linaro.org

arch/arm64/boot/dts/qcom/msm8998.dtsi

@@ -900,7 +900,7 @@ anoc2_smmu: iommu@16c0000 {
 		};
 
 		pcie0: pci@1c00000 {
-			compatible = "qcom,pcie-msm8996";
+			compatible = "qcom,pcie-msm8998", "qcom,pcie-msm8996";
 			reg =	<0x01c00000 0x2000>,
 				<0x1b000000 0xf1d>,
 				<0x1b000f20 0xa8>,