net/can: activate bit-timing calculation and netlink based drivers by default

The two options "CAN bit-timing calculation" and
"Platform CAN drivers with Netlink support" have a "default Y". In order to
activate them by default, change to "default y".

Signed-off-by: Marc Kleine-Budde <mkl@pengutronix.de>
Acked-by: Wolfgang Grandegger <wg@grandegger.com>
Acked-by: Kurt Van Dijck <kurt.van.dijck@eia.be>
Signed-off-by: David S. Miller <davem@davemloft.net>