drm/i915: Plumb drm_framebuffer into more places

Now that framebuffers can be used even before calling
drm_framebuffer_init() we can start to plumb them into more places,
instead of passing individual pieces for fb metadata.

Signed-off-by: Ville Syrjälä <ville.syrjala@linux.intel.com>
Reviewed-by: Imre Deak <imre.deak@intel.com>
Link: http://patchwork.freedesktop.org/patch/msgid/20170307194210.13400-2-ville.syrjala@linux.intel.com