arm64: dts: qcom: x1e80100: Add SMP2P nodes

SMP2P is used for interrupting and being interrupted about remoteproc
state changes related to the audio, compute and sensor subsystems.

Signed-off-by: Sibi Sankar <quic_sibis@quicinc.com>
Reviewed-by: Konrad Dybcio <konrad.dybcio@linaro.org>
Signed-off-by: Abel Vesa <abel.vesa@linaro.org>
Link: https://lore.kernel.org/r/20240129-x1e80100-dts-missing-nodes-v6-2-2c0e691cfa3b@linaro.org
Signed-off-by: Bjorn Andersson <andersson@kernel.org>