usbdebug: Fix data toggle on receive

USB device end toggles data PID when we ACK'd the zero-length data
packet. As USB host we need to toggle data PID too or the next data
received would get discarded.

Change-Id: I3203bc874c7ded9244c7548a666d7041a0fbb379
Signed-off-by: Kyösti Mälkki <kyosti.malkki@gmail.com>
Reviewed-on: http://review.coreboot.org/4775
Tested-by: build bot (Jenkins)
Reviewed-by: Aaron Durbin <adurbin@google.com>

src/drivers/usb/ehci_debug.c

@@ -204,7 +204,6 @@ host_retry:
 
 	/* If I get an ACK or in-sync DATA PID, we are done. */
 	if ((lpid == USB_PID_ACK) || (lpid == pipe->pid)) {
-		if (DBGP_LEN(rd_ctrl))
 		pipe->pid ^= USB_PID_DATA_TOGGLE;
 	}