Before this patch, when a new head is found its information is printed
first as "updated" and then as "found" in the log.
The reason is that drm_head_create() calls drm_head_update_info() which
printed the head as "changed". Then drm_head_create() itself prints it
as "found".
This fixes it to print only once as "found".
Signed-off-by: Pekka Paalanen <pekka.paalanen@collabora.com>