arm64: dts: qcom: sm6350: add IPA node

IPA is used for mobile data. Add a node describing it.

Signed-off-by: Luca Weiss <luca.weiss@fairphone.com>
Signed-off-by: Alex Elder <elder@linaro.org>
Signed-off-by: Bjorn Andersson <andersson@kernel.org>
Link: https://lore.kernel.org/r/20230104193759.3286014-2-elder@linaro.org