merge-files: fix test_signatures failed
*remove do_unpack[nostamp] and do_install[nostamp] to fix the below error:
|merge-files:do_unpack:
d2dd30367d5f5126514809c29f4b60f3 ->
83d69c6e61f2de297c0acb94f3531689
|bitbake-diffsigs --task merge-files do_unpack --signature
d2dd30367d5f5126514809c29f4b60f3 83d69c6e61f2de297c0acb94f3531689
|NOTE: Starting bitbake server...
|Taint (by forced/invalidated task) changed from nostamp:
a4c64ee4-dc12-4ba0-b598-
d47afd77eefb to nostamp:
49eb1718-bacc-46d8-9658-
779aff62b7ee
Signed-off-by: Chunrong Guo <chunrong.guo@nxp.com>
Signed-off-by: Otavio Salvador <otavio@ossystems.com.br>
