mpc5200: Fix Kconfig dependancies on MPC5200 FEC device driver

When not building an arch/powerpc kernel, the mpc5200 FEC driver depends
on some symbols which are not defined (BESTCOMM & BESTCOMM_FEC).

This patch flips around the dependancy logic so that it cannot be
selected unless BESTCOMM_FEC is selected first.  Kconfig stops
complaining this way.

Also, the driver only works for arch/powerpc (not arch/ppc) anyway so
it should depend on PPC_MERGE also.
Signed-off-by: NGrant Likely <grant.likely@secretlab.ca>
Signed-off-by: NJeff Garzik <jeff@garzik.org>

drivers/net/Kconfig

@@ -1883,9 +1883,7 @@ config FEC2
 
 config FEC_MPC52xx
 	tristate "MPC52xx FEC driver"
-	depends on PPC_MPC52xx
-	select PPC_BESTCOMM
-	select PPC_BESTCOMM_FEC
+	depends on PPC_MERGE && PPC_MPC52xx && PPC_BESTCOMM_FEC
 	select CRC32
 	select PHYLIB
 	---help---