nouveau/dispnv50: add cursor pitch check

The hardware needs a FB which is packed. Add checks to make sure
this is the case.

While at it, add debug logs for the existing checks. This allows
user-space to more easily figure out why a configuration is
rejected.

v2:
- Use drm_format_info instead of hardcoding bytes-per-pixel (Ilia)
- Remove unnecessary size check (Ilia)

v3:
- Add missing newlines in debug messages (Lyude)
- Use NV_ATOMIC (Lyude)
- Add missing debug log for invalid format (Ilia)

v4: add plane name in debug messages (Ilia)

Signed-off-by: Simon Ser <[email protected]>
Reviewed-by: Lyude Paul <[email protected]>
Reviewed-by: Ilia Mirkin <[email protected]>
Cc: Ben Skeggs <[email protected]>
Link: https://patchwork.freedesktop.org/patch/msgid/[email protected]

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