The core now checks that the plane supports the fb's format+modifier
combination, so we can drop the related checks from
skl_check_ccs_aux_surface(). These checks were specific to
SKL/KBL/BXT anyway.

Cc: Ben Widawsky <ben@bwidawsk.net>
Cc: Jason Ekstrand <jason@jlekstrand.net>
Cc: Daniel Stone <daniels@collabora.com>
Signed-off-by: Ville Syrjälä <ville.syrjala@linux.intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20171222192231.17981-9-ville.syrjala@linux.intel.comReviewed-by: Mika Kahola <mika.kahola@intel.com>