include: replace unifdef-y with header-y

unifdef-y and header-y has same semantic.
So there is no need to have both.

Drop the unifdef-y variant and sort all lines again

Signed-off-by: Sam Ravnborg <sam@ravnborg.org>

include/linux/dvb/Kbuild

@@ -1,9 +1,8 @@
+header-y += audio.h
 header-y += ca.h
+header-y += dmx.h
 header-y += frontend.h
 header-y += net.h
 header-y += osd.h
 header-y += version.h
-
-unifdef-y += audio.h
-unifdef-y += dmx.h
-unifdef-y += video.h
+header-y += video.h