arm64: dts: qcom: talkman: Add Synaptics RMI4 touchscreen

This adds touchscreen capabilities to the Lumia 950.

Signed-off-by: Konrad Dybcio <konradybcio@gmail.com>
Link: https://lore.kernel.org/r/20201005150313.149754-9-konradybcio@gmail.com


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