Add a new system-to-vendor sysprop ro.apex.updatable

The system property is for system to be able to identify vendor
implementation that is ready to support updatable APEXes. When this
sysprop is set to true, the init creates separate mount namespaces for
processes launched before apexd. When unset, default is false.

Bug: 122428178
Test: device boots to the UI
Test: atest android.appsecurity.cts.ExternalStorageHostTest
Change-Id: I4ae1eac5eec5f5085d8d32ff58300dfa9967c29a
1 file changed