bitbake-bblayers/create: Make the example recipe print its message
The example recipe is setup to print a message using bb.plain() in the
"do_build" task but this task is "noexec" so the message never prints.
This might be confusing.
This moves the message printing into another "do_display_banner" task
and add it to the do_build "before" list.
Signed-off-by: Yoann Congal <yoann.congal@smile.fr> Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>
