C2 VTS: Set "default" store as preferred store

Test: make vts -j123 && vts-tradefed run commandAndExit vts \
-m VtsHalMediaC2V1_0Host

Bug: 142782942
Change-Id: Iba03d8b8c48351a8cc4f2ed3eb2451d649ad8cac
4 files changed