security: fix FC for security option

If device is a low-memory one then the key_enable_widget dependency can't be removed.
So, move the logic to disable maximize widget feature for low-memory devices.

Signed-off-by: Humberto Borba <humberos@gmail.com>
Change-Id: I2b6aa44e26f6fb9371da7ef61d9e85a13643ba30
Settings: Center the lockscreen target

Before this the lockscreen picker was off center in the vertical and horizontal
layouts.

However I am still unable to get the horizontal one centered correctly (it's a
lot better than before though). If anyone knows how to fix this please let me
know or just update

Change-Id: I7bf9d8fbc5969e03e052049d951ac2a1bc048823