drm/i915: Wrap plane update/disable hook calls

Wrap the .update_plane()/.update_slave()/.disable_plane() vfunc
calls into helpers which also take care to emit the appropriate
tracepoint.

Signed-off-by: Ville Syrjälä <ville.syrjala@linux.intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20190206204910.13965-4-ville.syrjala@linux.intel.com


Reviewed-by: Rodrigo Vivi <rodrigo.vivi@intel.com>