settings: hide qs tiles with sensitive data

This changes add an option to respect the new sensitive data flag of the QS tiles when
lockscreen is showing and lockscreen is secure.

Requires: topic:hide-qs-tiles

JIRA: CML-140
JIRA: BACON-3519
JIRA: CYAN-6720
Signed-off-by: Jorge Ruesga <jorge@ruesga.com>
Signed-off-by: Adnan Begovic <adnan@cyngn.com>

Change-Id: I940d2353f92d8c4724d5d3dcb9860aec1dff288f