drm/i915: Reject Yf tiling for HDR formats, v2.

drm/i915: Reject Yf tiling for HDR formats, v2.

This was missing in the original addition of those formats, but in
PLANE_SIZE description it's mentioned that 8 cpp formats are not
valid with Yf tiling. Reject this case properly.

Also reject Y21x Yf tiling support this is also not supported.

Changes since v1:
- Reject Y21x as well.

Signed-off-by: Maarten Lankhorst <maarten.lankhorst@linux.intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20190322135954.20434-2-maarten.lankhorst@linux.intel.com
Reviewed-by: Ville Syrjälä <ville.syrjala@linux.intel.com>