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_ccm.function b/tests/suites/test_suite_ccm.function
index 16f9f8e..2e374c0 100644
--- a/tests/suites/test_suite_ccm.function
+++ b/tests/suites/test_suite_ccm.function
@@ -218,12 +218,12 @@
     memset( source_address, 0x00, sizeof( source_address ) );
     memset( frame_counter, 0x00, sizeof( frame_counter ) );
 
-    key_len = unhexify( key, key_hex );
-    msg_len = unhexify( msg, msg_hex );
-    add_len = unhexify( add, add_hex );
-    result_len = unhexify( result, result_hex );
-    source_address_len = unhexify( source_address, source_address_hex );
-    frame_counter_len = unhexify( frame_counter, frame_counter_hex );
+    key_len = mbedtls_test_unhexify( key, key_hex );
+    msg_len = mbedtls_test_unhexify( msg, msg_hex );
+    add_len = mbedtls_test_unhexify( add, add_hex );
+    result_len = mbedtls_test_unhexify( result, result_hex );
+    source_address_len = mbedtls_test_unhexify( source_address, source_address_hex );
+    frame_counter_len = mbedtls_test_unhexify( frame_counter, frame_counter_hex );
 
     if( sec_level % 4 == 0)
         tag_len = 0;
@@ -286,12 +286,12 @@
     memset( frame_counter, 0x00, sizeof( frame_counter ) );
     memset( tag, 0x00, sizeof( tag ) );
 
-    key_len = unhexify( key, key_hex );
-    msg_len = unhexify( msg, msg_hex );
-    add_len = unhexify( add, add_hex );
-    result_len = unhexify( result, result_hex );
-    source_address_len = unhexify( source_address, source_address_hex );
-    frame_counter_len = unhexify( frame_counter, frame_counter_hex );
+    key_len = mbedtls_test_unhexify( key, key_hex );
+    msg_len = mbedtls_test_unhexify( msg, msg_hex );
+    add_len = mbedtls_test_unhexify( add, add_hex );
+    result_len = mbedtls_test_unhexify( result, result_hex );
+    source_address_len = mbedtls_test_unhexify( source_address, source_address_hex );
+    frame_counter_len = mbedtls_test_unhexify( frame_counter, frame_counter_hex );
 
     if( sec_level % 4 == 0)
         tag_len = 0;