tests: Add mbedtls_test_ prefix to *hexify functions

Add mbedtls_test_ prefix to hexify() and unhexify()
test helper functions.

Command to change *.function files:
find . -name "*.function" -exec awk -i inplace \
    '{sub(/(un|)hexify\>/,"mbedtls_test_&")}1' {} \;

Signed-off-by: Ronald Cron <ronald.cron@arm.com>
diff --git a/tests/suites/test_suite_nist_kw.function b/tests/suites/test_suite_nist_kw.function
index 9c34ea6..827c690 100644
--- a/tests/suites/test_suite_nist_kw.function
+++ b/tests/suites/test_suite_nist_kw.function
@@ -259,9 +259,9 @@
     memset( msg, 0x00, sizeof( msg ) );
     memset( result, '+', sizeof( result ) );
 
-    key_len = unhexify( key, key_hex );
-    msg_len = unhexify( msg, msg_hex );
-    result_len = unhexify( expected_result, result_hex );
+    key_len = mbedtls_test_unhexify( key, key_hex );
+    msg_len = mbedtls_test_unhexify( msg, msg_hex );
+    result_len = mbedtls_test_unhexify( expected_result, result_hex );
     output_len = sizeof( result );
 
     TEST_ASSERT( mbedtls_nist_kw_setkey( &ctx, cipher_id, key, key_len * 8, 1 )
@@ -306,9 +306,9 @@
     memset( result, '+', sizeof( result ) );
     memset( expected_result, 0x00, sizeof( expected_result ) );
 
-    key_len = unhexify( key, key_hex );
-    msg_len = unhexify( msg, msg_hex );
-    result_len = unhexify( expected_result, result_hex );
+    key_len = mbedtls_test_unhexify( key, key_hex );
+    msg_len = mbedtls_test_unhexify( msg, msg_hex );
+    result_len = mbedtls_test_unhexify( expected_result, result_hex );
     output_len = sizeof( result );
 
     TEST_ASSERT( mbedtls_nist_kw_setkey( &ctx, cipher_id, key, key_len * 8, 0 )