can: remove useless defaults in Kconfig

There's no need for "default N' (or 'default n') as it's default.
Signed-off-by: NKurt Van Dijck <kurt.van.dijck@eia.be>
Acked-by: NMarc Kleine-Budde <mkl@pengutronix.de>
Signed-off-by: NDavid S. Miller <davem@davemloft.net>

drivers/net/can/Kconfig

@@ -4,7 +4,6 @@ menu "CAN Device Drivers"
 config CAN_VCAN
 	tristate "Virtual Local CAN Interface (vcan)"
 	depends on CAN
-	default N
 	---help---
 	  Similar to the network loopback devices, vcan offers a
 	  virtual local CAN interface.
@@ -15,7 +14,6 @@ config CAN_VCAN
 config CAN_SLCAN
 	tristate "Serial / USB serial CAN Adaptors (slcan)"
 	depends on CAN
-	default N
 	---help---
 	  CAN driver for several 'low cost' CAN interfaces that are attached
 	  via serial lines or via USB-to-serial adapters using the LAWICEL
@@ -125,7 +123,6 @@ source "drivers/net/can/softing/Kconfig"
 config CAN_DEBUG_DEVICES
 	bool "CAN devices debugging messages"
 	depends on CAN
-	default N
 	---help---
 	  Say Y here if you want the CAN device drivers to produce a bunch of
 	  debug messages to the system log.  Select this if you are having