linux-phytec-ti

PCI: dwc: Add *ops* to start and stop pcie link

Add start_link and stop_link ops in dw_pcie_ops to start or stop
the link. This will be used by endpoint functions to start the
link once the setup has been done.

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