drm/i915: restore debug message lost in merge resolution

Restore debug message lost in merge commit e1b73cba13. Also clarify it
that we are only clamping bpp not overwriting it.

Signed-off-by: Imre Deak <imre.deak@intel.com>
Signed-off-by: Daniel Vetter <daniel.vetter@ffwll.ch>
1 file changed