OMX 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 VtsHalMediaOmxV1_0Host

Bug: 138388013
Bug: 140358266
Change-Id: I824b84ef8570ba501cf8137d695f98c335f92c7b
Merged-In: I824b84ef8570ba501cf8137d695f98c335f92c7b