Revert "usb: gadget: u_ether: Re-attach netif device to mirror detachment"

This reverts commit 76c94573.

Prerequisite revert for the reverting of the original commit f49449fb.

Fixes: 76c94573 ("usb: gadget: u_ether: Re-attach netif device to mirror detachment")
Fixes: f49449fb

 ("usb: gadget: u_ether: Replace netif_stop_queue with netif_device_detach")
Reported-by: Ferry Toth <fntoth@gmail.com>
Cc: stable@vger.kernel.org
Signed-off-by: Ferry Toth <fntoth@gmail.com>
Link: https://lore.kernel.org/r/20240620204832.24518-2-ftoth@exalondelft.nl
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>