dt-bindings: arm: qcom: add the sa8775p-ride board

Document the sa8775p SoC and its reference board: sa8775p-ride.

Signed-off-by: Bartosz Golaszewski <bartosz.golaszewski@linaro.org>
Acked-by: Krzysztof Kozlowski <krzysztof.kozlowski@linaro.org>
Signed-off-by: Bjorn Andersson <andersson@kernel.org>
Link: https://lore.kernel.org/r/20230201152038.203387-5-brgl@bgdev.pl