Build: Small workaround

  * Until the real problem is solved lets unmount partions prior to flash
  * Based on Vonnegut@XDA recommendation

Change-Id: If2ec54f5e273f1c92868672ed365f246ace54b70
Signed-off-by: Josue Rivera <prbassplayer@gmail.com>

Conflicts:
	tools/releasetools/ota_from_target_files
build: add back libjni_latinime.so

Change-Id: Ic0b8748354328eb1fd760181ffa0c919b63a33a9