backports: drop display output class support

Jean nuked display output class support so we won't
be needing the respective headers for compilation on
backports now. This is as seen on next-20140409.

commit f167a64e9d67ebd03d304e369c12011cf2bffaf5
Author: Jean Delvare <jdelvare@suse.de>
Date:   Mon Mar 17 15:49:10 2014 +0100

    video / output: Drop display output class support

    It was only ever used by the ACPI video driver, and that only use case
    vanished over 3 years ago (see commit 677bd810, "ACPI video: remove
    output switching control".) So this is dead code and I guess we can
    remove it now.

    Signed-off-by: Jean Delvare <jdelvare@suse.de>
    Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>

Signed-off-by: Luis R. Rodriguez <mcgrof@do-not-panic.com>
diff --git a/copy-list b/copy-list
index 76ce1c3..2794c0c 100644
--- a/copy-list
+++ b/copy-list
@@ -163,7 +163,6 @@
 include/media/
 
 include/linux/videodev2.h
-include/linux/video_output.h
 
 include/uapi/linux/media.h
 include/uapi/linux/dvb/