net: Kconfig: move the CAN device menu to the "Device Drivers" section

The devices are meant to be under the "Device Drivers" category of the
menuconfig. The CAN subsystem is currently one of the rare exception
with all of its devices under the "Networking support" category.

The CAN_DEV menuentry gets moved to fix this discrepancy. The CAN menu
is added just before MCTP in order to be consistent with the current
order under the "Networking support" menu.

A dependency on CAN is added to CAN_DEV so that the CAN devices only
show up if the CAN subsystem is enabled.

Link: https://lore.kernel.org/all/20220610143009.323579-6-mailhol.vincent@wanadoo.fr
Signed-off-by: Vincent Mailhol <mailhol.vincent@wanadoo.fr>
Acked-by: Max Staudt <max@enpas.org>
Tested-by: Oliver Hartkopp <socketcan@hartkopp.net>
Signed-off-by: Marc Kleine-Budde <mkl@pengutronix.de>

drivers/net/Kconfig

@@ -499,6 +499,8 @@ config NET_SB1000
 
 source "drivers/net/phy/Kconfig"
 
+source "drivers/net/can/Kconfig"
+
 source "drivers/net/mctp/Kconfig"
 
 source "drivers/net/mdio/Kconfig"

drivers/net/can/Kconfig

@@ -3,6 +3,7 @@
 menuconfig CAN_DEV
 	tristate "CAN Device Drivers"
 	default y
+	depends on CAN
 	help
 	  Controller Area Network (CAN) is serial communications protocol up to
 	  1Mbit/s for its original release (now known as Classical CAN) and up

net/can/Kconfig

@@ -15,7 +15,8 @@ menuconfig CAN
 	  PF_CAN is contained in <Documentation/networking/can.rst>.
 
 	  If you want CAN support you should say Y here and also to the
-	  specific driver for your controller(s) below.
+	  specific driver for your controller(s) under the Network device
+	  support section.
 
 if CAN
 
@@ -69,6 +70,4 @@ config CAN_ISOTP
 	  If you want to perform automotive vehicle diagnostic services (UDS),
 	  say 'y'.
 
-source "drivers/net/can/Kconfig"
-
 endif