misc: pci_endpoint_test: remove duplicate macro PCI_ENDPOINT_TEST_STATUS

PCI_ENDPOINT_TEST_STATUS is already defined in pci_endpoint_test.c along
with the status bits, drop the duplicate definition.

Signed-off-by: Lad Prabhakar <prabhakar.mahadev-lad.rj@bp.renesas.com>
Signed-off-by: Lorenzo Pieralisi <lorenzo.pieralisi@arm.com>