test/packaging: Don't set MAKEFLAGS

It's handled by autotest_common.sh so there's no need to override it.

Change-Id: I7a5cfd8e1cb2ed342c4e4ca99eadb19f54f54118
Signed-off-by: Michal Berger <michal.berger@intel.com>
Reviewed-on: https://review.spdk.io/gerrit/c/spdk/spdk/+/20624


Reviewed-by: Konrad Sztyber <konrad.sztyber@intel.com>
Tested-by: SPDK CI Jenkins <sys_sgci@intel.com>
Reviewed-by: Pawel Piatek <pawelx.piatek@intel.com>
Reviewed-by: Jaroslaw Chachulski <jaroslawx.chachulski@intel.com>
Reviewed-by: Jim Harris <jim.harris@samsung.com>