arm64: dts: qcom: msm8992/4-lumia*: Create a common DTS

Lumia 950 and 950XL are both based on the Octagon board, sharing
the vast majority of components, configuration etc. Commonize it.

Signed-off-by: Gustave Monce <gustave.monce@outlook.com>
Signed-off-by: Konrad Dybcio <konrad.dybcio@somainline.org>
Link: https://lore.kernel.org/r/20210131013853.55810-6-konrad.dybcio@somainline.org


Signed-off-by: Bjorn Andersson <bjorn.andersson@linaro.org>