net: ks8842 depends on DMA_ENGINE

ks8842 uses dma channel functions, so it should depend on DMA_ENGINE.

ERROR: "__dma_request_channel" [drivers/net/ks8842.ko] undefined!
ERROR: "dma_release_channel" [drivers/net/ks8842.ko] undefined!
Signed-off-by: Randy Dunlap <randy.dunlap@oracle.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

drivers/net/Kconfig

@@ -1751,7 +1751,7 @@ config TLAN
 
 config KS8842
 	tristate "Micrel KSZ8841/42 with generic bus interface"
-	depends on HAS_IOMEM
+	depends on HAS_IOMEM && DMA_ENGINE
 	help
 	 This platform driver is for KSZ8841(1-port) / KS8842(2-port)
 	 ethernet switch chip (managed, VLAN, QoS) from Micrel or