arm64: dts: qcom: sm8550-mtp: enable adsp, cdsp & mdss

Add the aDSP, cDSP and MPSS firmware and "Devicetree" firmware paths
for the SM8550 MTP platform.

Signed-off-by: Neil Armstrong <neil.armstrong@linaro.org>
Signed-off-by: Bjorn Andersson <andersson@kernel.org>
Link: https://lore.kernel.org/r/20221115-topic-sm8550-upstream-dts-remoteproc-v3-3-815a1753de34@linaro.org