[netdrvr] Fix dependencies for ax88796 ne2k clone driver

It needs writesb(), not available on all platforms.
Signed-off-by: Jeff Garzik <jeff@garzik.org>

drivers/net/Kconfig

@@ -199,6 +199,7 @@ source "drivers/net/arm/Kconfig"
 
 config AX88796
 	tristate "ASIX AX88796 NE2000 clone support"
+	depends on ARM || MIPS
 	select CRC32
 	select MII
 	help