ARM: dts: qcom: ipq4018-ap120c-ac: Add SoC compatible

Add qcom,ipq4018 compatible fallback for the SoC.

Signed-off-by: Krzysztof Kozlowski <krzysztof.kozlowski@linaro.org>
Reviewed-by: Konrad Dybcio <konrad.dybcio@somainline.org>
Signed-off-by: Bjorn Andersson <andersson@kernel.org>
Link: https://lore.kernel.org/r/20221013155418.47577-3-krzysztof.kozlowski@linaro.org