drm/vkms: drop "Multiple overlay planes" TODO

Remove the task from the TODO list.

Signed-off-by: José Expósito <[email protected]>
Reviewed-by: Melissa Wen <[email protected]>
Signed-off-by: Melissa Wen <[email protected]>
Link: https://patchwork.freedesktop.org/patch/msgid/[email protected]

Author: JoseExposito

Documentation/gpu/vkms.rst

@@ -124,8 +124,6 @@ Add Plane Features
 
 There's lots of plane features we could add support for:
 
-- Multiple overlay planes. [Good to get started]
-
 - Clearing primary plane: clear primary plane before plane composition (at the
   start) for correctness of pixel blend ops. It also guarantees alpha channel
   is cleared in the target buffer for stable crc. [Good to get started]