[automerger skipped] Fix mMobileIfaces is not protected by lock am: f5dc09bc7c -s ours

am skip reason: Merged-In Ie7694a63f5203ee7c83830ca13d97219b7949fd7 with SHA-1 14946edca3 is already in history

Original change: https://googleplex-android-review.googlesource.com/c/platform/frameworks/base/+/15283494

Change-Id: I4d2c4e0af9137e380ab0ca71008721d95907cf3c