style(expect): normalize debugging messages

A minor style cleanup to the messages printed by the Expect scripts to
make them a bit more consistent and descriptive.

Signed-off-by: Chris Kay <chris.kay@arm.com>
Change-Id: Ibd8ccb4423bd5aaeffc99c2f3602123794dc6200
diff --git a/expect/ffa_test_driver.exp b/expect/ffa_test_driver.exp
index eb98e4b..92adbb1 100644
--- a/expect/ffa_test_driver.exp
+++ b/expect/ffa_test_driver.exp
@@ -9,7 +9,7 @@
 expect {
         "buildroot login:" {
                 send "\n\nroot\n"
-                puts "<<Linux Booted>>"
+                message "Linux Booted"
         }
 }
 
@@ -32,9 +32,8 @@
 
 expect {
         "Total Failures: 0" {
-                puts "<<SUCCESS>>"
+                message "SUCCESS"
         }
 }
 
 exit_uart 0
-