When MBEDTLS_USE_PSA_CRYPTO is disabled on a base of full, mention it.
Don't explicitly mention MBEDTLS_PSA_CRYPTO_CONFIG when also mentioning
PSA_WANT_xxx, since PSA_WANT symbols are only meaningful when
MBEDTLS_PSA_CRYPTO_CONFIG is enabled.
Signed-off-by: Gilles Peskine <Gilles.Peskine@arm.com>