drm/i915/fbc: Allow FBC with Yf tiling

FBC+Yf tiling seems to work just fine, and unlike with linear
the hardware does appear to correctly calculate the CFB stride
with using the override stride on both cfl and glk. So no need
for any additional tweaks.

Cc: Uma Shankar <uma.shankar@intel.com> #v2
Signed-off-by: Ville Syrjälä <ville.syrjala@linux.intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20210924141330.1515-1-ville.syrjala@linux.intel.com
Reviewed-by: Uma Shankar <uma.shankar@intel.com>

drivers/gpu/drm/i915/display/intel_fbc.c

@@ -746,6 +746,7 @@ static bool tiling_is_valid(struct drm_i915_private *dev_priv,
 	switch (modifier) {
 	case DRM_FORMAT_MOD_LINEAR:
 	case I915_FORMAT_MOD_Y_TILED:
+	case I915_FORMAT_MOD_Yf_TILED:
 		return DISPLAY_VER(dev_priv) >= 9;
 	case I915_FORMAT_MOD_X_TILED:
 		return true;