arm64: dts: qcom: Add base SM8550 dtsi

Add base dtsi for SM8550 SoC and includes base description of
CPUs, GCC, RPMHCC, UART, interrupt controller, TLMM, reserved
memory, RPMh PD, TCSRCC, ITS, IPCC, AOSS QMP, LLCC, cpufreq,
interconnect, thermal sensor, cpu cooling maps and SMMU nodes
which helps boot to shell with console on boards with this SoC.

Co-developed-by: Neil Armstrong <neil.armstrong@linaro.org>
Signed-off-by: Neil Armstrong <neil.armstrong@linaro.org>
Signed-off-by: Abel Vesa <abel.vesa@linaro.org>
Reviewed-by: Konrad Dybcio <konrad.dybcio@linaro.org>
Reviewed-by: Sai Prakash Ranjan <quic_saipraka@quicinc.com>