net: core: Support UID-based routing.

This contains the following commits:

1. 0149763 net: core: Add a UID range to fib rules.
2. 1650474 net: core: Use the socket UID in routing lookups.
3. 0b16771 net: ipv4: Add the UID to the route cache.
4. ee058f1 net: core: Add a RTA_UID attribute to routes.
    This is so that userspace can do per-UID route lookups.

Bug: 15413527
Change-Id: I1285474c6734614d3bda6f61d88dfe89a4af7892
Signed-off-by: Lorenzo Colitti <lorenzo@google.com>

Conflicts:
	net/ipv6/ping.c
smdk4412: Provide available freq sysfs for exynos.

Needed for the frequency slider in Performance Settings to work properly.

Change-Id: If01258234d216a1ee37fb7b090c012b3d6cd09be
Disable SELINUX