octeontx2-af: Update Tx link register range

On new silicons the TX channels for transmit level has increased.
This patch fixes the respective register offset range to
configure the newly added channels.

Fixes: b279bbb3

 ("octeontx2-af: NIX Tx scheduler queue config support")
Signed-off-by: Rahul Bhansali <rbhansali@marvell.com>
Signed-off-by: Geetha sowjanya <gakula@marvell.com>
Reviewed-by: Wojciech Drewek <wojciech.drewek@intel.com>
Signed-off-by: Paolo Abeni <pabeni@redhat.com>