Merge "[SystemUI] 1.Remove the unnecessary log 2. update signal icon in bg thread" into sc-qpr1-dev am: c3af8564f9

Original change: https://googleplex-android-review.googlesource.com/c/platform/frameworks/base/+/16033980

Change-Id: Id9b5ba50323921f9265bf5ce9ef53aaccd464975