cxgbe(4): Dump the firmware log before falling back to a minimal config.

It might have errors that explain why the attempted configuration
failed.

MFC after:	1 week
Sponsored by:	Chelsio Communications

sys/dev/cxgbe/t4_main.c

@@ -5096,6 +5096,7 @@ partition_resources(struct adapter *sc)
 retry:
 	rc = apply_cfg_and_initialize(sc, cfg_file, &caps_allowed);
 	if (rc != 0 && fallback) {
+		dump_devlog(sc);
 		device_printf(sc->dev,
 		    "failed (%d) to configure card with \"%s\" profile, "
 		    "will fall back to a basic configuration and retry.\n",