netdevsim: associate bound programs with shared dev

Move bound program information from netdevsim to shared sub-object,
as programs will soon be shared between netdevs of the same ASIC.

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