arm64: dts: qcom: add initial support for qcom sa8775p-ride

This adds basic support for the Qualcomm sa8775p platform and the
reference board: sa8775p-ride. The dt files describe the basics of the
SoC and enable booting to shell.

Signed-off-by: Bartosz Golaszewski <bartosz.golaszewski@linaro.org>
Reviewed-by: Konrad Dybcio <konrad.dybcio@linaro.org>
Signed-off-by: Bjorn Andersson <andersson@kernel.org>
Link: https://lore.kernel.org/r/20230214092713.211054-3-brgl@bgdev.pl