'set -x' is added to package postinstall scripts. It causes trace
information are printed when image first time boots such as core-image-sato.
Remove it.
(From OE-Core rev: 38ac187881266e6349084ee983046e311fb293e9)
Signed-off-by: Kai Kang <kai.kang@windriver.com>
Signed-off-by: Saul Wold <sgw@linux.intel.com>
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>