Gate secure element support by a separate config option

Secure element support has its own source file, and in addition
requires many hooks in other files. This is a nontrivial amount of
code, so make it optional (but default on).
diff --git a/programs/test/query_config.c b/programs/test/query_config.c
index fc25353..ee754d9 100644
--- a/programs/test/query_config.c
+++ b/programs/test/query_config.c
@@ -1509,6 +1509,14 @@
     }
 #endif /* MBEDTLS_PSA_CRYPTO_C */
 
+#if defined(MBEDTLS_PSA_CRYPTO_SE_C)
+    if( strcmp( "MBEDTLS_PSA_CRYPTO_SE_C", config ) == 0 )
+    {
+        MACRO_EXPANSION_TO_STR( MBEDTLS_PSA_CRYPTO_SE_C );
+        return( 0 );
+    }
+#endif /* MBEDTLS_PSA_CRYPTO_SE_C */
+
 #if defined(MBEDTLS_PSA_CRYPTO_STORAGE_C)
     if( strcmp( "MBEDTLS_PSA_CRYPTO_STORAGE_C", config ) == 0 )
     {