"dl_path" replaces the ${CM_SOURCE} in dl_hook
"dl_files" replaces the ${CM_EXEC} in dl_hook
debrepack extracts the "dl_path" automatically and
copies the "dl_files" to build directory, so no longer
need the dl_hook, and remove the untar operation in
debian/rules.
Test Plan:
Pass: successfully build test
Story: 2009101
Task: 43715
Signed-off-by: Yue Tao <yue.tao@windriver.com>
Change-Id: Id11fa62cc510808899ba79f5f2a44cd65bd97109