imx-drm: stricter plane parameter checking, dw_hdmi-imx and dmfc fixes

- Check whether plane parameters comply with IPU IDMAC limitations and
  fix planar YUV 4:2:0 U/V offsets and stride
- Cleanup encoder in dw_hdmi-imx bind error path and
  remove a superfluous platform_set_drvdata in dw_hdmi-imx
- DMFC setup fixes: lock the ipu_dmfc_init_channel function against
  concurrent use, rename it to ipu_dmfc_config_wait4eot, and call
  it after the FIFO size has been determined.
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