tc_filter: resolve device name before parsing filter

tc_filter: resolve device name before parsing filter

Move resolving device name into an ifindex before calling filter
specific callbacks.  This way if filters need the ifindex, they
can read it from the request.

Signed-off-by: Jakub Kicinski <jakub.kicinski@netronome.com>
Reviewed-by: Quentin Monnet <quentin.monnet@netronome.com>
Acked-by: Daniel Borkmann <daniel@iogearbox.net>