Rename parse_attribute_value_ber_encoded

Now renamed to parse_attribute_value_der_encoded to be consistent with
names elsewhere

Signed-off-by: Agathiyan Bragadeesh <agathiyan.bragadeesh2@arm.com>
diff --git a/library/x509_create.c b/library/x509_create.c
index dba76a9..77f5066 100644
--- a/library/x509_create.c
+++ b/library/x509_create.c
@@ -189,7 +189,7 @@
 }
 
 #if defined(MBEDTLS_ASN1_PARSE_C)
-static int parse_attribute_value_ber_encoded(const char *s,
+static int parse_attribute_value_der_encoded(const char *s,
                                              int len,
                                              unsigned char *data,
                                              size_t *data_len,
@@ -275,7 +275,7 @@
         if (!in_attr_type && ((*c == ',' && *(c-1) != '\\') || c == end)) {
 #if defined(MBEDTLS_ASN1_PARSE_C)
             if ((parse_ret =
-                     parse_attribute_value_ber_encoded(s, (int) (c - s), data, &data_len,
+                     parse_attribute_value_der_encoded(s, (int) (c - s), data, &data_len,
                                                        &tag)) != 0) {
                 if (numericoid) {
                     mbedtls_free(oid.p);