drm/i915: fix ppgtt dump code for DEBUG_FS=n
drm/i915: fix ppgtt dump code for DEBUG_FS=n

A regression in the topic/ppgtt branch introduce in

commit 87d60b63e0371529faaed0667d457e5022964010
Author: Ben Widawsky <73675debcd8a436be48ec22211dcf44fe0df0a64@bwidawsk.net>
Date:   Fri Dec 6 14:11:29 2013 -0800

    drm/i915: Add PPGTT dumper

The issue is that we're missing the definitions for the seq_file
functions and hence compilation fails.

v2: Just include the right header instead of splattering #ifdefs all
over the place (Chris).

Cc: Chris Wilson <711c73f64afdce07b7e38039a96d2224209e9a6c@chris-wilson.co.uk>
Reported-by: kbuild test robot <24f7fe9d205c8a9f6ade0c2894e14303ca16087f@intel.com>
Reported-by: Antti Koskipaa <7a56f34651dc9afb7a41d71fc3e3a28b59e34272@linux.intel.com>
Cc: Ben Widawsky <73675debcd8a436be48ec22211dcf44fe0df0a64@bwidawsk.net>
Reviewed-by: Ben Widawsky <73675debcd8a436be48ec22211dcf44fe0df0a64@bwidawsk.net>
Signed-off-by: Daniel Vetter <c1b6782c4af8f0673da8923a0702a1832e5940f4@ffwll.ch>

KristFoundation/Programs,KristFoundation/Programs,KristFoundation/Programs,KristFoundation/Programs,KristFoundation/Programs,KristFoundation/Programs