[automerger skipped] DO NOT MERGE Add cross-user check for getDefaultSmsPackage(). am: 0abccabf am: bd70751b -s ours

am skip reason: subject contains skip directive

Original change: https://googleplex-android-review.googlesource.com/c/platform/frameworks/base/+/14987346

Change-Id: Ibcebf42c9284f3cb0846c60aa7cdd7294fce4f35