Validate ringtone URIs before setting

 Add checks URIs for content from other users.
 Fail for users that are not profiles of the current user.

Test: atest DefaultRingtonePreferenceTest
Bug: 299614635
(cherry picked from https://googleplex-android-review.googlesource.com/q/commit:7ba175eaeb6e8f1ea54e2ec13685d1cf1e9aad1c)
Merged-In: Ib266b285a3a1c6c5265ae2321159e61e08e349f6
Change-Id: Ib266b285a3a1c6c5265ae2321159e61e08e349f6