Address symmetric-only comments

Signed-off-by: Ryan Everett <ryan.everett@arm.com>
diff --git a/configs/config-symmetric-only.h b/configs/config-symmetric-only.h
index ad6a441..faeab17 100644
--- a/configs/config-symmetric-only.h
+++ b/configs/config-symmetric-only.h
@@ -18,10 +18,6 @@
 #define MBEDTLS_HAVE_TIME_DATE
 
 /* Mbed TLS feature support */
-#define MBEDTLS_CIPHER_MODE_XTS
-#define MBEDTLS_CIPHER_PADDING_ONE_AND_ZEROS
-#define MBEDTLS_CIPHER_PADDING_ZEROS_AND_LEN
-#define MBEDTLS_CIPHER_PADDING_ZEROS
 #define MBEDTLS_ERROR_STRERROR_DUMMY
 #define MBEDTLS_FS_IO
 #define MBEDTLS_ENTROPY_NV_SEED
diff --git a/configs/crypto-config-symmetric-only.h b/configs/crypto-config-symmetric-only.h
index 799890d..5d6bf85 100644
--- a/configs/crypto-config-symmetric-only.h
+++ b/configs/crypto-config-symmetric-only.h
@@ -33,17 +33,20 @@
 #define PSA_WANT_ALG_RIPEMD160                  1
 #define PSA_WANT_ALG_SHA_1                      1
 #define PSA_WANT_ALG_STREAM_CIPHER              1
-#define PSA_WANT_ALG_TLS12_ECJPAKE_TO_PMS       1
-#define PSA_WANT_ALG_TLS12_PRF                  1
-#define PSA_WANT_ALG_TLS12_PSK_TO_MS            1
-
-/* The library does not currently support enabling SHA-224 without SHA-256.
- * A future version of the library will have this option disabled
- * by default. */
 #define PSA_WANT_ALG_SHA_224                    1
 #define PSA_WANT_ALG_SHA_256                    1
 #define PSA_WANT_ALG_SHA_384                    1
 #define PSA_WANT_ALG_SHA_512                    1
+#define PSA_WANT_ALG_SHA3_224                   1
+#define PSA_WANT_ALG_SHA3_256                   1
+#define PSA_WANT_ALG_SHA3_384                   1
+#define PSA_WANT_ALG_SHA3_512                   1
+#define PSA_WANT_ALG_TLS12_ECJPAKE_TO_PMS       1
+#define PSA_WANT_ALG_TLS12_PRF                  1
+#define PSA_WANT_ALG_TLS12_PSK_TO_MS            1
+
+/* XTS is not yet supported via the PSA API in Mbed TLS. */
+//#define PSA_WANT_ALG_XTS                        1
 
 #define PSA_WANT_KEY_TYPE_AES                   1
 #define PSA_WANT_KEY_TYPE_ARIA                  1