settings: open add tile dialog

Shows the "add tile" dialog QuickSettingsTiles activity when the user press
the add tile button in the system bar

Change-Id: Id416b85aa11cee6fd586ee322650d421ca83cdf0
Signed-off-by: Jorge Ruesga <jorge@ruesga.com>
Revert "settings: open add tile dialog"

This reverts commit 7770e01e570769724d92a38d614ae6804466cdea.

Change-Id: I3df0ad3e4d02deb86ae9e0d634431b2a4624deab
Merge remote-tracking branch 'upstream/cm-11.0' into HEAD