Without this initialization ehci->qh_list[0].qh_endpt2 is left uninitialized,
which causes problems with some EHCI host controllers.

Das u-boot uses the same strategy:

	static int ehci_common_init(struct ehci_ctrl *ctrl, uint tweaks)
	{
		...
		qh_list = &ctrl->qh_list;

		/* Set head of reclaim list */
		memset(qh_list, 0, sizeof(*qh_list));
		qh_list->qh_link = cpu_to_hc32((unsigned long)qh_list | QH_LINK_TYPE_QH);
		qh_list->qh_endpt1 = cpu_to_hc32(QH_ENDPT1_H(1) |
							QH_ENDPT1_EPS(USB_SPEED_HIGH));
		qh_list->qh_overlay.qt_next = cpu_to_hc32(QT_NEXT_TERMINATE);
		qh_list->qh_overlay.qt_altnext = cpu_to_hc32(QT_NEXT_TERMINATE);
		qh_list->qh_overlay.qt_token =
				cpu_to_hc32(QT_TOKEN_STATUS(QT_TOKEN_STATUS_HALTED));
		...
	}

Signed-off-by: Peter Mamonov <pmamonov@gmail.com>
Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de>