Fix typo in PSA ECC curve config option

Fix SEC to SECP as the curve name.  This fixes failing tests that
verified the config option was working.

Signed-off-by: David Brown <david.brown@linaro.org>
diff --git a/include/mbedtls/config_psa.h b/include/mbedtls/config_psa.h
index e46b32e..8fb8153 100644
--- a/include/mbedtls/config_psa.h
+++ b/include/mbedtls/config_psa.h
@@ -406,7 +406,7 @@
 
 #if defined(PSA_WANT_ECC_SECP_K1_256)
 #if !defined(MBEDTLS_PSA_ACCEL_ECC_SECP_K1_256)
-#define MBEDTLS_ECP_DP_SEC256K1_ENABLED
+#define MBEDTLS_ECP_DP_SECP256K1_ENABLED
 #define MBEDTLS_PSA_BUILTIN_ECC_SECP_K1_256 1
 #endif /* !MBEDTLS_PSA_ACCEL_ECC_SECP_K1_256 */
 #endif /* PSA_WANT_ECC_SECP_K1_256 */
@@ -657,7 +657,7 @@
 #define PSA_WANT_ECC_SECP_K1_224
 #endif
 
-#if defined(MBEDTLS_ECP_DP_SEC256K1_ENABLED)
+#if defined(MBEDTLS_ECP_DP_SECP256K1_ENABLED)
 #define MBEDTLS_PSA_BUILTIN_ECC_SECP_K1_256 1
 #define PSA_WANT_ECC_SECP_K1_256
 #endif