Merge "Revert "Revert "Listen for individual subscription mobile data toggles""" am: ab7f5b533d am: 1ff62d0578 am: 1cdff0cb4f

Original change: https://android-review.googlesource.com/c/platform/frameworks/base/+/1949076

Change-Id: I7dd4bf61147bc3104b6d2108f2751f901dded922