drm/i915: Add the missing Y/Yf modifiers for SKL+ sprites

Y/Yf were dropped out from the SKL+ sprite modifier list on account
of some watermark issues Daniel Stone was having. My subsequent testing
seemed to indicate that things work better now, so add the modifiers
back in.

v2: Update the commit message with a better explanation

Cc: Ben Widawsky <ben@bwidawsk.net>
Cc: Jason Ekstrand <jason@jlekstrand.net>
Cc: Daniel Stone <daniels@collabora.com>
Signed-off-by: NVille Syrjälä <ville.syrjala@linux.intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20171222192231.17981-4-ville.syrjala@linux.intel.comReviewed-by: NDaniel Vetter <daniel.vetter@ffwll.ch>

drivers/gpu/drm/i915/intel_sprite.c

@@ -1162,6 +1162,8 @@ static uint32_t skl_plane_formats[] = {
 };
 
 static const uint64_t skl_plane_format_modifiers[] = {
+	I915_FORMAT_MOD_Yf_TILED,
+	I915_FORMAT_MOD_Y_TILED,
 	I915_FORMAT_MOD_X_TILED,
 	DRM_FORMAT_MOD_LINEAR,
 	DRM_FORMAT_MOD_INVALID