pch_can: depends on PCI

Fix pch_can build when CONFIG_PCI is not enabled.  It uses pci interfaces
and data structures, so it should depend on PCI.

drivers/net/can/pch_can.c:1044: error: implicit declaration of function 'pci_enable_msi'
drivers/net/can/pch_can.c:1079: error: implicit declaration of function 'pci_disable_msi'
Signed-off-by: Randy Dunlap <randy.dunlap@oracle.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

drivers/net/can/Kconfig

@@ -84,7 +84,7 @@ config CAN_FLEXCAN
 
 config PCH_CAN
 	tristate "PCH CAN"
-	depends on  CAN_DEV
+	depends on CAN_DEV && PCI
 	---help---
 	  This driver is for PCH CAN of Topcliff which is an IOH for x86
 	  embedded processor.