Add Security Service.

MIUI-28526

Change-Id: I72a61f832e225b30d2b359122479184be8d4ca89
Signed-off-by: mochangming <mochangming@xiaomi.com>

Conflicts:

	framework.jar.out/smali/android/app/ContextImpl.smali
	services.jar.out/smali/com/android/server/ServerThread.smali