(drivers) ti816x: Fix transmit handler
(drivers) ti816x: Fix transmit handler

Packet length was calculated wrong

Kakadu/embox,embox/embox,embox/embox,Kakadu/embox,Kakadu/embox,Kakadu/embox,Kakadu/embox,embox/embox,Kakadu/embox,embox/embox,Kakadu/embox,embox/embox,embox/embox