samples: tfm_integration: psa_crypto: improve the MbedTLS configuration

Move supported configuration items from the custom MbedTLS user
configuration file over to the Kconfig overlay.
The correct macros are then defined by the MbedTLS module according
to the values of the Kconfig options.

Signed-off-by: Tomi Fontanilles <tomi.fontanilles@nordicsemi.no>

samples/tfm_integration/psa_crypto/prj.conf

@@ -28,6 +28,12 @@ CONFIG_MBEDTLS_HEAP_SIZE=32768
 CONFIG_MBEDTLS_USER_CONFIG_ENABLE=y
 CONFIG_MBEDTLS_USER_CONFIG_FILE="user-tls-conf.h"
 
+CONFIG_MBEDTLS_PSA_CRYPTO_C=y
+CONFIG_MBEDTLS_ENTROPY_ENABLED=y
+CONFIG_MBEDTLS_ECP_C=y
+CONFIG_MBEDTLS_ECP_DP_SECP256R1_ENABLED=y
+CONFIG_MBEDTLS_ECDSA_C=y
+
 # JSON
 CONFIG_JSON_LIBRARY=y
 

samples/tfm_integration/psa_crypto/src/tls_config/user-tls-conf.h

@@ -4,21 +4,7 @@
  * SPDX-License-Identifier: Apache-2.0
  */
 
-#define MBEDTLS_USE_PSA_CRYPTO
-#define MBEDTLS_PSA_CRYPTO_C
-
-#define MBEDTLS_ENTROPY_C
-#define MBEDTLS_TEST_NULL_ENTROPY
-
-#define MBEDTLS_ECP_C
-#define MBEDTLS_ECP_DP_SECP256R1_ENABLED
-#define MBEDTLS_ECDSA_C
-
 #define MBEDTLS_X509_CSR_WRITE_C
 #define MBEDTLS_X509_CREATE_C
 #define MBEDTLS_PEM_WRITE_C
 #define MBEDTLS_BASE64_C
-#define MBEDTLS_OID_C
-#define MBEDTLS_ASN1_WRITE_C
-#define MBEDTLS_PK_WRITE_C
-#define MBEDTLS_PK_C