arm64: dts: qcom: x1e80100-romulus: Set up PCIe3 / SDCard reader

The Surface Laptops have a Realtek RTS5261 SD Card reader connected
over a Gen1x1 link to the PCIe3 host. Set up the necessary bits to
make it functional.

Signed-off-by: Konrad Dybcio <konrad.dybcio@oss.qualcomm.com>
Link: https://lore.kernel.org/r/20241129-topic-sl7_feat2-v2-2-fb6cf5660cfc@oss.qualcomm.com


Signed-off-by: Bjorn Andersson <andersson@kernel.org>