arm64: dts: qcom: sc8280xp: add TCSR node

Add the TCSR node which is needed for PCIe configuration.

Signed-off-by: Johan Hovold <johan+linaro@kernel.org>
Reviewed-by: Krzysztof Kozlowski <krzysztof.kozlowski@linaro.org>
Signed-off-by: Bjorn Andersson <andersson@kernel.org>
Link: https://lore.kernel.org/r/20221024125843.25261-1-johan+linaro@kernel.org