build: Support SECURED mode on csdk stack test
build: Support SECURED mode on csdk stack test

MLK as also checked, no further changes needed

Bug: https://jira.iotivity.org/browse/IOT-1684
Change-Id: Id0fda3c253e1cafae6552c0e37afbfffd0ce98cf
Signed-off-by: Philippe Coval <ff46fec9739d31cce915aabcc3a7a2c00eee4d6c@osg.samsung.com>
Reviewed-on: https://gerrit.iotivity.org/gerrit/15381
Tested-by: jenkins-iotivity <09cb29e8a2b473a2c978382eec13ee06fa017bda@opendaylight.org>
Reviewed-by: Kevin Kane <cd40c34e976f30c9e62efcf24e04c516bc3a3b05@microsoft.com>
Reviewed-by: George Nash <acbdc39d528a4315fe0b532d55c50ae46f5c1667@intel.com>
Reviewed-by: Greg Zaverucha <2f0d3dd2b5482c8dc3947b5bbc6908a123ec7ed4@microsoft.com>
Reviewed-by: Mats Wichmann <7a5e6f27299d2bbd9d04b59d9e8e4f8eab83d8cb@linux.com>
Reviewed-by: Nivedita Singhvi <b40a35969d04ec4f378b791a1a34ee1853ae1b15@gmail.com>
Reviewed-by: Habib Virji <40be98b50fb6c4d79bd282a617e2cc82e300d47f@samsung.com>

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