arm64: dts: qcom: sdm632: fairphone-fp3: add touchscreen

Add Himax hx83112b touchscreen to the FP3 DT.

Signed-off-by: Job Noorman <job@noorman.info>
Reviewed-by: Krzysztof Kozlowski <krzysztof.kozlowski@linaro.org>
Signed-off-by: Bjorn Andersson <andersson@kernel.org>
Link: https://lore.kernel.org/r/20221107105604.26541-4-job@noorman.info