net: sparx5: ditch sparx5_fdma_rx/tx_reload() functions

These direction specific functions can be ditched in favor of a single
function: sparx5_fdma_reload(), which retrieves the channel id from the
fdma struct instead.

Signed-off-by: Daniel Machon <daniel.machon@microchip.com>
Reviewed-by: Steen Hegelund <Steen.Hegelund@microchip.com>
Reviewed-by: Jens Emil Schulz Østergaard <jensemil.schulzostergaard@microchip.com>
Reviewed-by: Horatiu Vultur <horatiu.vultur@microchip.com>
Signed-off-by: David S. Miller <davem@davemloft.net>