misc: pci_endpoint_test: Add Device ID for RZ/G2H PCIe controller

misc: pci_endpoint_test: Add Device ID for RZ/G2H PCIe controller

Add Renesas R8A774E1 in pci_device_id table so that pci-epf-test
can be used for testing PCIe EP on RZ/G2H.

Link: https://lore.kernel.org/r/20200904103851.3946-4-prabhakar.mahadev-lad.rj@bp.renesas.com
Signed-off-by: Lad Prabhakar <prabhakar.mahadev-lad.rj@bp.renesas.com>
Signed-off-by: Lorenzo Pieralisi <lorenzo.pieralisi@arm.com>
Reviewed-by: Biju Das <biju.das.jz@bp.renesas.com>
Reviewed-by: Geert Uytterhoeven <geert+renesas@glider.be>