Add feature support for AES for PSA crypto config

Basic support for enabling AES through PSA_WANT_KEY_TYPE_AES.

Signed-off-by: David Brown <david.brown@linaro.org>
diff --git a/include/mbedtls/config_psa.h b/include/mbedtls/config_psa.h
index 69a6a31..d011c38 100644
--- a/include/mbedtls/config_psa.h
+++ b/include/mbedtls/config_psa.h
@@ -220,6 +220,12 @@
 #endif /* !MBEDTLS_PSA_ACCEL_KEY_TYPE_RSA_PUBLIC_KEY */
 #endif /* PSA_WANT_KEY_TYPE_RSA_PUBLIC_KEY */
 
+#if defined(PSA_WANT_KEY_TYPE_AES)
+#if !defined(MBEDTLS_PSA_ACCEL_KEY_TYPE_AES)
+#define MBEDTLS_AES_C
+#endif /* !MBEDTLS_PSA_ACCEL_KEY_TYPE_AES */
+#endif /* PSA_WANT_KEY_TYPE_AES */
+
 #else /* MBEDTLS_PSA_CRYPTO_CONFIG */
 
 /*
@@ -328,6 +334,10 @@
 #define PSA_WANT_ALG_SHA_512 1
 #endif
 
+#if defined(MBEDTLS_AES_C)
+#define PSA_WANT_KEY_TYPE_AES 1
+#endif
+
 #endif /* MBEDTLS_PSA_CRYPTO_CONFIG */
 
 #ifdef __cplusplus