Add missing dependencies for TEST_NS_T_COSE

TEST_NS_T_COSE requires QCBOR library, thus it must be included in build.

Previously this was not done thus build of -DTEST_NS_T_COSE=ON with
other tests OFF failed.

Now it is fixed.

Signed-off-by: Bohdan Hunko <Bohdan.Hunko@infineon.com>
Change-Id: I16522a88b2b436ee700aa88b69e194ad1e932c2e