In automatically generated PSA test cases, we detect cryptographic
mechanisms that are not implemented, and skip the corresponding test cases.
Originally this detection was intended for mechanisms for which the PSA_WANT
symbols were not implemented, but then it morphed into skipping mechanisms
that are declared in crypto_values.h but not actually implemented. So it no
longer makes sense to skip the test cases for which a negative
dependency (!PSA_WANT_xxx) is not implemented.
This causes more not-supported test cases to run.
Signed-off-by: Gilles Peskine <Gilles.Peskine@arm.com>