Remove config-psa-crypto.h

This configuration file was useful in the early days of PSA crypto
development. It stopped becoming relevant when MBEDTLS_PSA_CRYPTO_C entered
the default configuration. Remove it: better late than never.

Signed-off-by: Gilles Peskine <Gilles.Peskine@arm.com>

tests/scripts/test-ref-configs.pl

@@ -36,8 +36,6 @@ my %configs = (
     },
     'config-no-entropy.h' => {
     },
-    'config-psa-crypto.h' => {
-    },
     'config-suite-b.h' => {
         'compat' => "-m tls1_2 -f 'ECDHE-ECDSA.*AES.*GCM' -p mbedTLS",
     },