tests/qtest/libqos/e1000e: Refer common PCI ID definitions

This is yet another minor cleanup to ease understanding and
future refactoring of the tests.

Signed-off-by: Akihiko Odaki <akihiko.odaki@daynix.com>
Message-Id: <20221103015017.19947-1-akihiko.odaki@daynix.com>
Reviewed-by: Philippe Mathieu-Daudé <philmd@linaro.org>
Signed-off-by: Thomas Huth <thuth@redhat.com>