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Add support to add virtual function in endpoint core. The virtual function can only be associated with a physical function instead of a endpoint controller. Provide APIs to associate a virtual function with a physical function here. [weiyongjun1@huawei.com: PCI: endpoint: Fix missing unlock on error in pci_epf_add_vepf() - Reported-by: Hulk Robot <hulkci@huawei.com>] Link: https://lore.kernel.org/r/20210819123343.1951-3-kishon@ti.com Signed-off-by: Kishon Vijay Abraham I <kishon@ti.com> Signed-off-by: Wei Yongjun <weiyongjun1@huawei.com> Signed-off-by: Lorenzo Pieralisi <lorenzo.pieralisi@arm.com>