Do not allow untrusted apps to read sysfs_net files

(this includes /sys/class/net/*/address device mac addresses)

Test: builds
Bug: 137816564
Change-Id: I84268b2e0207559ed00baafb8a3f231c676f8df1
Signed-off-by: Maciej Żenczykowski <maze@google.com>
1 file changed