Enable improved user separation by default.
This is already on for all Pixel devices with no problems observed.
If this causes issues with a specific device (e.g. vendor apps being
unable to access their data) it can be temporarily disabled by adding
PRODUCT_PROPERTY_OVERRIDES += ro.vold.level_from_user=0
to the device.mk file. Please file a bug if that happens.
Bug:
141677108
Test: presubmits
Ignore-AOSP-First: Want to assess impact internally before CP to AOSP
Change-Id: Ic9da534f1a5f4c9e3bd62ea5c09a3b11ebcb33e7