Merge changes I32af5459,I198fb9b7,I0d61ea11,I59d9b8f7 into pie-gsi

* changes:
  Unzip bin and libs from otatools.zip for build_mixed
  Revise comments for when -v, -m options are needed
  Check first if system_dir and device_dir exists
  Print error on missing device target_files archive