misc: pci_endpoint_test: Add deviceID for AM64 and J7200

Add device ID specific to AM64 and J7200 in pci_endpoint_test so that
endpoints configured with those deviceIDs can use pci_endpoint_test
driver.

Signed-off-by: Kishon Vijay Abraham I <kishon@ti.com>
Signed-off-by: Vignesh Raghavendra <vigneshr@ti.com>