dt-bindings: PCI: qcom: Add SM8350

Add bindings for two PCIe hosts on SM8350 platform. The only difference
between them is in the aggre0 clock, which warrants the oneOf clause for
the clocks properties.

Link: https://lore.kernel.org/r/20221118233242.2904088-2-dmitry.baryshkov@linaro.org


Signed-off-by: Dmitry Baryshkov <dmitry.baryshkov@linaro.org>
Signed-off-by: Lorenzo Pieralisi <lpieralisi@kernel.org>
Signed-off-by: Bjorn Helgaas <bhelgaas@google.com>
Reviewed-by: Rob Herring <robh@kernel.org>