ARM: dts: qcom-msm8974: Remove properties that are always overriden

Model and compatible are set per-device, so having them in the SoC DTSI is
superfluous. Remove them.

Signed-off-by: Konrad Dybcio <konrad.dybcio@somainline.org>
Signed-off-by: Bjorn Andersson <bjorn.andersson@linaro.org>
Link: https://lore.kernel.org/r/20220415115633.575010-3-konrad.dybcio@somainline.org