Fix emulated volumes not created for secondary users

Fix emulated volumes not created for secondary users

Ifabaa12368e5a591fbcdce4ee71c83ff35fdac6b introduced individual
emulated volumes for each Android user. The change however didn't
create the volumes for the secondary users on user start in vold
without the persist.sys.fuse flag

Now we always create the volumes but only mount sdcardfs volumes
for user 0 because the sdcardfs mount paths do not change with for
different users unlike the FUSE mount paths.

Bug: 144473552
Test: atest AdoptableHostTest
Test: Start a guest user in Settings and launch chrome browser in that
user, verify that chrome does not crash

Change-Id: I89f3591d0197d86267f0e3934f496273e2f9fd7e