mt76: mt76u: fix endpoint definition order

commit 23cb16d2 upstream.

Even if they are not currently used fix BK/BE endpoint definition order.

Fixes: b40b15e1 ("mt76: add usb support to mt76 layer")
Signed-off-by: Lorenzo Bianconi <lorenzo@kernel.org>
Signed-off-by: Felix Fietkau <nbd@nbd.name>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>