drm/i915: Remove a stale and misplaced comment

The load detection code has moved around at some point, but it left
a comment behind. The code now looks to be different enough to make
the comment stale as well. Just remove it.

Signed-off-by: Ville Syrjälä <ville.syrjala@linux.intel.com>
Reviewed-by: Chris Wilson <chris@chris-wilson.co.uk>
Signed-off-by: Daniel Vetter <daniel.vetter@ffwll.ch>