On Qcom SoCs, the PCIe host bridge is connected to a single PCIe bridge
for each controller instance. Hence, add a node to represent the bridge.

While at it, let's remove the bridge properties from board dts as they are
now redundant.
Signed-off-by: Manivannan Sadhasivam <manivannan.sadhasivam@linaro.org>
Reviewed-by: Konrad Dybcio <konrad.dybcio@linaro.org>
Link: https://lore.kernel.org/r/20240321-pcie-qcom-bridge-dts-v2-9-1eb790c53e43@linaro.orgSigned-off-by: Bjorn Andersson <andersson@kernel.org>