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TI's J784S4 SoC has two instances of PCIe Controller namely PCIe0 and PCIe1 which are Cadence PCIe Controllers. Add support to configure PCIe instances in Endpoint mode of operation. While at it disable all endpoint functions except function 0 during probe to prevent the Root Complex from enumerating unconfigured functions. This ensures only properly configured endpoint functions are visible to the host and avoids enumeration issues with multi-function devices. Signed-off-by: Hrushikesh Salunke <h-salunke@ti.com>