SystemUI: res array for statusbar blocked icons

Create an array in packages/SystemUI/res/values/config.xml for statusbar
blocked icons to make it easier to overlay wanted options instead of
having to change them in code.

Test: m, verify vibrate-icon is not visible in collapsed statusbar
      on keyguard or launcher.
Signed-off-by: Timi Rautamäki <timi.rautamaki@gmail.com>
Change-Id: I9a04a67a9c0914989d34c8c53ceee97788e7ba6c
Merged-In: I9a04a67a9c0914989d34c8c53ceee97788e7ba6c