Prototype remove labels in QS

Add flag to not show labels in QS. This also makes it show more rows.

Added a switch in customizer to toggle the setting.

Some visual issues when toggling (media player), fixed by collapsing and
reopening QS.

In user builds, can be toggled with:

`adb shell settings put secure sysui_remove_labels {0, 1}`

Test: manual
Change-Id: I750c53d918b2d9590ff86eed67d1932444390828