tests/codegen.py: removing unecessary print statement

A huge amount of output(boilerplate code) is
printed to the console screen.
This is not critical to the test results.
Removing them should be harmless.

It causes issues in Yocto Project when we run
automated testing.
https://bugzilla.yoctoproject.org/show_bug.cgi?id=14170

Signed-off-by: Yi Fan Yu <yifan.yu@windriver.com>
10 jobs for remove_print in 22 minutes and 36 seconds (queued for 1 second)
latest
Status Job ID Name Coverage
  Style Check
passed check-todos #1130300

00:01:44

passed style-check-diff #1130299

00:01:55

 
  Build
passed cross-android_api21_arm64 #1130303

00:01:10

passed cross-android_api28_arm64 #1130304

00:01:35

passed cross-mingw64 #1130305

00:01:37

passed debian-stable-x86_64 #1130302

00:02:10

passed fedora-x86_64 #1130301

00:08:22

passed msys2-mingw32 #1130306
win32-ps

00:07:36

passed vs2017-x64 #1130307
win32-ps

00:07:50

 
  Coverage
passed coverage #1130308

00:01:54

76.2%