linux-phytec-ti

misc: Add host side pci driver for pci test function device

Add PCI endpoint test driver that can verify base address
register, legacy interrupt/MSI interrupt and read/write/copy
buffers between host and device. The corresponding pci-epf-test
function driver should be used on the EP side.

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