Separate out sysui state updating

- Only update the disabled/screen pinning states when the disabled flags
  change, and not when the status bar panel height changes since that may
  be called frequently

Bug: 138640355
Test: Manual, lock/unlock, ensure that we don't get extra calls
Change-Id: Icbb03f1fef67e1254f03d85e4293f3b1a0ec4d6e