net: lan966x: Change lan966x_police_del return type

As the function always returns 0 change the return type to be
void instead of int. In this way also remove a wrong message
in case of error which would never happen.

Signed-off-by: Horatiu Vultur <horatiu.vultur@microchip.com>
Reviewed-by: Alvin Šipraga <alsi@bang-olufsen.dk>
Reviewed-by: Simon Horman <simon.horman@corigine.com>
Link: https://lore.kernel.org/r/20230312195155.1492881-1-horatiu.vultur@microchip.com


Signed-off-by: Jakub Kicinski <kuba@kernel.org>