Lockscreen: See through (2/2)

Based off this commit, https://github.com/PAC-man/android_packages_apps_Settings/commit/37c895abc64591315eab132d38d2e0e03ea0b725.
- Rework the initial commit that I submitted the other day.


Change-Id: Ib077e17f042d5f4fe5fa0b88ecbf1e0f7bc2108f
Signed-off-by: Lokesh Chamane <lokesh.c703@gmail.com>