endeavoru: Add prebuilt/audio files from device tree

Change-Id: I3297f23c13b133ba934bbf35be850310fa838131
endeavoru: Add Flash_Loader.conf and board_version.txt

Change-Id: Ibdb6385dc62bcb9efca181be0cdbdcb405de0380
Merge pull request #11 from thoemy/cleanup

endeavoru: Move files from device tree to vendor