Add a quick SELinux mode toggle

There's no way to make it persistent, by design. This is purposefully
undocumented and meant to test policies at this stage.

Change-Id: Ic79ed773b199b68fee15f94acd2107a5ad20dc25
Signed-off-by: Evan Anderson <evan1124@gmail.com>

Conflicts:
	src/com/android/settings/DeviceInfoSettings.java

Derp

Change-Id: Icf51de5d4b98b930c2cb77f3bcd0ed1009abfc52
Signed-off-by: Evan Anderson <evan1124@gmail.com>