usb: host: fix a typo in ehci.h

Change "ehci_hq" to "ehci_qh" in this comment.
Signed-off-by: Xu Yang <xu.yang_2@nxp.com>
Link: https://lore.kernel.org/r/20221128081306.2772729-1-xu.yang_2@nxp.comSigned-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

drivers/usb/host/ehci.h

@@ -471,7 +471,7 @@ struct ehci_iso_sched {
  * acts like a qh would, if EHCI had them for ISO.
  */
 struct ehci_iso_stream {
-	/* first field matches ehci_hq, but is NULL */
+	/* first field matches ehci_qh, but is NULL */
 	struct ehci_qh_hw	*hw;
 
 	u8			bEndpointAddress;