init-ifupdown: modify interfaces for busybox

Busybox ifupdown does not recognize /xxx names, so we
use eth0 instead of /eth0.  If we want to find "predictable name"
interfaces starting with en..., we will have to use the
real ifupdown.

(From OE-Core rev: 091b4410c88b0fdefee3490bca6479881c0da293)

Signed-off-by: Joe Slater <joe.slater@windriver.com>
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>

meta/recipes-core/init-ifupdown/init-ifupdown-1.0/interfaces

@@ -14,10 +14,11 @@ iface wlan0 inet dhcp
 iface atml0 inet dhcp
 
 # Wired or wireless interfaces including predictable names
-auto /eth0
+auto eth0
 iface eth0 inet dhcp
 iface eth1 inet dhcp
 
+# Busybox ifupdown won't process /en* correctly
 auto /en*=eth
 iface eth inet dhcp