Tell vold about users sharing storage with each other.

In some cases (eg clone profiles), users can see each others volumes.
Vold needs to know this information to setup a mount infrastructure that
avoids page cache inconsistencies.

Bug: 228271997
Test: manual
Change-Id: Ie41bd3b52e105e8bb17f6d5985f00ed2a359bc1b
1 file changed