arm64: dts: qcom: sc7280: Describe the first PCIe controller and PHY

arm64: dts: qcom: sc7280: Describe the first PCIe controller and PHY

Only one PCIe controller has been described so far, but the SC7280 has
two controllers/phys. Describe the second one as well.

Signed-off-by: Bjorn Andersson <bjorn.andersson@oss.qualcomm.com>
Reviewed-by: Krzysztof Kozlowski <krzysztof.kozlowski@linaro.org>
Reviewed-by: Dmitry Baryshkov <dmitry.baryshkov@oss.qualcomm.com>
Link: https://lore.kernel.org/r/20250811-sc7280-pcie0-v1-1-6093e5b208f9@oss.qualcomm.com
Signed-off-by: Bjorn Andersson <andersson@kernel.org>