drm/vkms: drop "Rotation" TODO

Now that VKMS supports all values of rotation and reflection, drop the
"Rotation" task from the TODO list.
Signed-off-by: Maíra Canal <mcanal@igalia.com>
Reviewed-by: Melissa Wen <mwen@igalia.com>
Signed-off-by: Maíra Canal <mairacanal@riseup.net>
Link: https://patchwork.freedesktop.org/patch/msgid/20230418130525.128733-7-mcanal@igalia.com

Documentation/gpu/vkms.rst

@@ -120,7 +120,7 @@ There's lots of plane features we could add support for:
 
 - Add background color KMS property[Good to get started].
 
-- Rotation, scaling.
+- Scaling.
 
 - Additional buffer formats, especially YUV formats for video like NV12.
   Low/high bpp RGB formats would also be interesting.