Use status_bar_padding_top for status bar elements

In status bar, keyguard, and quicksettings, things that live in the
"status bar" area now properly obey status_bar_padding_top.

Also refresh layout resources on configuration change in the status bar,
fixing a couple of annoying bugs

Test: manual
Bug: 151221263
Change-Id: Ib4474ae2bd52919c2eecf9400c2711fd224fcc09