TCL scripts: replace "puts" with "echo"

Signed-off-by: Antonio Borneo <borneo.antonio@gmail.com>

tcl/test/selftest.cfg

@@ -8,7 +8,7 @@ proc selftest {tmpfile address size} {
    }
 
    for {set i 0} {$i < 10 } {set i [expr $i+1]} {
-    puts "Test iteration $i"
+    echo "Test iteration $i"
     dump_image $tmpfile $address $size
 	verify_image $tmpfile $address bin
 	load_image $tmpfile $address bin