Codec2 VTS: Move device resource files to data/local/tmp

Some devices make /sdcard a symbolic link to a non-constant target. The
target changes between the setup and the execution, so files pushed to
/sdcard during the setup cannot be found when the test runs.

Test: vts-tradefed run vts -m VtsHalMediaC2V1_0Host

Bug: 138388013
Change-Id: Ia27bd9eedfc6f97225abb553c4b8efbb8957966e