When resuming after a system suspend, re-issue the UHCI_CMD_MAXP

command in case this setting was not saved. Since bandwidth reclamation
(-current only) often results in bus activity continuing to the end
of every frame, most transfers would fail with IOERROR if this
setting is missed.

Reviewed by:	n_hibma
MFC after:	1 week

sys/dev/usb/uhci.c

@@ -720,6 +720,7 @@ uhci_power(int why, void *v)
 		UHCICMD(sc, cmd & ~UHCI_CMD_EGSM); /* back to normal */
 		UWRITE2(sc, UHCI_INTR, UHCI_INTR_TOCRCIE | UHCI_INTR_RIE |
 			UHCI_INTR_IOCE | UHCI_INTR_SPIE); /* re-enable intrs */
+		UHCICMD(sc, UHCI_CMD_MAXP);
 		uhci_run(sc, 1); /* and start traffic again */
 		usb_delay_ms(&sc->sc_bus, USB_RESUME_RECOVERY);
 		sc->sc_bus.use_polling--;