Add PNP info to PCI attachment of et driver

Reviewed by: imp, chuck
Submitted by: Lakhan Shiva Kamireddy <lakhanshiva@gmail.com>
Sponsored by: Google, Inc. (GSoC 2018)
Differential Revision: https://reviews.freebsd.org/D15979

sys/dev/et/if_et.c

@@ -188,6 +188,8 @@ static driver_t et_driver = {
 static devclass_t et_devclass;
 
 DRIVER_MODULE(et, pci, et_driver, et_devclass, 0, 0);
+MODULE_PNP_INFO("U16:vendor;U16:device;D:#", pci, et, et_devices,
+    sizeof(et_devices[0]), nitems(et_devices) - 1);
 DRIVER_MODULE(miibus, et, miibus_driver, miibus_devclass, 0, 0);
 
 static int	et_rx_intr_npkts = 32;