dt-bindings: PCI: Convert marvell,armada8k-pcie to schema

dt-bindings: PCI: Convert marvell,armada8k-pcie to schema

Convert the marvell,armada8k-pcie binding to DT schema. The binding
uses different names for reg, clocks, and phys which have to be added
to the common Synopsys DWC binding.

The "marvell,reset-gpio" property was not documented. Mark it deprecated
as the "reset-gpios" property can be used instead. The "msi-parent"
property was also not documented.

Signed-off-by: Rob Herring (Arm) <robh@kernel.org>
Signed-off-by: Manivannan Sadhasivam <manivannan.sadhasivam@linaro.org>
Link: https://patch.msgid.link/20250414214135.1680076-1-robh@kernel.org