wembley: more correct sysfs_net labelling

The test only checks .../mtu because it's lazy.
But it's the entire network directory tree which should be labelled sysfs_net.

You can see other examples for other devices
with cs/ for "p:android genfscon.*sysfs_net"
these all end the path with /net

(vs "p:android genfscon.*/mtu.*sysfs_net" which only finds wembley)

Test: TreeHugger
Signed-off-by: Maciej Żenczykowski <maze@google.com>
Change-Id: Icb2f340127781e11d14b725bf37294c35749f0ca
1 file changed