drm/i915: Whitespace alignment fix for block header in display error state

The current output looks like:

Num Pipes: 2
Pipe [0]:
  SRC: 027f01df
Plane [0]:
  CNTR: d9000000
  STRIDE: 00001400
  SIZE: 031f04ff
  POS: 00000000
  ADDR: 00020000
Cursor [0]:
  CNTR: 00000000
  POS: 00000000
  BASE: 00000000
Pipe [1]:
  SRC: 04ff031f
Plane [1]:
  CNTR: 01000000
  STRIDE: 00000000
  SIZE: 018f02cf
  POS: 00000000
  ADDR: 00000000
Cursor [1]:
  CNTR: 00000000
  POS: 00000000
  BASE: 00000000
  CPU transcoder: A
  CONF: 00000000
  HTOTAL: 031f027f
  HBLANK: 03170287
  HSYNC: 02ef028f
  VTOTAL: 020c01df
  VBLANK: 020401e7
  VSYNC: 01eb01e9
  CPU transcoder: B
  CONF: 80000000
  HTOTAL: 059f04ff
  HBLANK: 059f04ff
  HSYNC: 054f052f
  VTOTAL: 0336031f
  VBLANK: 0336031f
  VSYNC: 03280322

which lacks the important visual clue to demarque the transcoder blocks
from the last cursor.

Signed-off-by: Chris Wilson <chris@chris-wilson.co.uk>
Cc: Daniel Vetter <daniel.vetter@ffwll.ch>
Signed-off-by: Daniel Vetter <daniel.vetter@ffwll.ch>