ARM: dts: qcom: sdx55: add IPA information

Add IPA-related nodes and definitions to "sdx55.dtsi".  The SMP2P
nodes (ipa_smp2p_out and ipa_smp2p_in) are already present.

Signed-off-by: Alex Elder <elder@linaro.org>
Link: https://lore.kernel.org/r/20210409155251.955632-1-elder@linaro.org


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