linux-phytec-ti

PCI: endpoint: Add callbacks for EPF initialization and data transfer

Add a callback to initialize EPF that is specific to EPC and a callback
to perfrom data transfer between EPC and remote PCIe RC. The endpoint
controller driver can use the dmaengine helper functions for data
transfer or have its own implementation of the internal DMA controller
present in PCIe EP.

Signed-off-by: Kishon Vijay Abraham I <kishon@ti.com>
Signed-off-by: Sekhar Nori <nsekhar@ti.com>