arm64: dts: qcom: sc8280xp/sa8540p: add PCIe2-4 nodes

The SC8280XP platform has seven PCIe controllers:

	PCIe0	USB4
	PCIe1	USB4
	PCIe2A	4-lane
	PCIe2B	2-lane
	PCIe3A	4-lane
	PCIe3B	2-lane
	PCIe4	1-lane

while SA8540P only has five (PCIe2-4).

Add devicetree nodes for the PCIe2-4 controllers and their PHYs.

Signed-off-by: Johan Hovold <johan+linaro@kernel.org>
Reviewed-by: Konrad Dybcio <konrad.dybcio@linaro.org>
Signed-off-by: Bjorn Andersson <andersson@kernel.org>
Link: https://lore.kernel.org/r/20221110103558.12690-2-johan+linaro@kernel.org