Merge "Apply FLAG_IMMUTABLE to the PendingIntent in NetworkStatService.java" am: 2c0bf15a21 am: fd32ff54dc am: 5e2b1cecaa

Original change: https://android-review.googlesource.com/c/platform/frameworks/base/+/1481721

Change-Id: Ia314010dcaeb89e9229fc17c09fb27f3cfff64a2