drm/imx: fix YUV primary plane and IPUv3 build corner case

- Enable color space conversion on the primary plane when the framebuffer
  format is a YUV format.
- The IPUv3 base driver now uses drm_format_info in the PRE/PRG code. The
  PRE/PRG parts are already disabled if DRM is not available. Enforce that
  if DRM is built as a module, IPUv3 must be built as a module, too.
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