Allow adb to pull profile snapshots

The snapshot profile produced with `adb cmd package snapshot-profile`
needs to be readable by the others group so that adb can pull it.

Test: adb shell cmd package snapshot-profile pkg;
      adb pull /data/misc/profman/pkg.prof
Bug: 74081010

Change-Id: Ibef8551704116e0b695f725e95f1671acbb82b5d