[netdrvr] Fix dependencies for ax88796 ne2k clone driver

It needs writesb(), not available on all platforms.

Signed-off-by: Jeff Garzik <jeff@garzik.org>
diff --git a/drivers/net/Kconfig b/drivers/net/Kconfig
index a3bef22..a64c2fb 100644
--- a/drivers/net/Kconfig
+++ b/drivers/net/Kconfig
@@ -199,6 +199,7 @@
 
 config AX88796
 	tristate "ASIX AX88796 NE2000 clone support"
+	depends on ARM || MIPS
 	select CRC32
 	select MII
 	help