That way we can actually import surfaces with modifiers & metadata
planes.

Tested with patches for ffmpeg to use this with kmsgrab & modifiers.

For AMD & multiplanar formats we always have 1 format plane = 1
memory plane, even with modifiers.

Intel (non Gallium) does have 1 format plane is 2 memory planes
for some modifiers with NV12. Currently with Gallium we don't really
have info about layer/plane ordering so this manually orders things
so that they align with Intel.

This shouldn't impact other drivers as without modifiers with metadata
planes this should give equivalent behavior to the old import path.

Reviewed-and-Tested-by: Leo Liu <leo.liu@amd.com>
Part-of: <!10815>