can: Kconfig: convert 'depends on CAN_DEV' into 'if CAN_DEV...endif' block

This patch adds an 'if CAN_DEV...endif' Block around the CAN driver
symbols in drivers/net/can/Kconfig. So the 'depends on CAN' dependencies
can be removed.

Signed-off-by: Marc Kleine-Budde <mkl@pengutronix.de>
diff --git a/drivers/net/can/mscan/Kconfig b/drivers/net/can/mscan/Kconfig
index d387069..f19be52 100644
--- a/drivers/net/can/mscan/Kconfig
+++ b/drivers/net/can/mscan/Kconfig
@@ -1,5 +1,5 @@
 config CAN_MSCAN
-	depends on CAN_DEV && (PPC || M68K)
+	depends on PPC || M68K
 	tristate "Support for Freescale MSCAN based chips"
 	---help---
 	  The Motorola Scalable Controller Area Network (MSCAN) definition