m68knommu: remove last use of CONFIG_FADS and CONFIG_RPXCLASSIC

They have never been used in this port of the driver. It is has only
ever been used on the ColdFire SoC ethernet core.
Signed-off-by: Greg Ungerer <gerg@uclinux.org>

drivers/net/fec.c

@@ -53,7 +53,7 @@
 #define	FEC_MAX_PORTS	1
 #endif
 
-#if defined(CONFIG_FADS) || defined(CONFIG_RPXCLASSIC) || defined(CONFIG_M5272)
+#if defined(CONFIG_M5272)
 #define HAVE_mii_link_interrupt
 #endif