gpu: drm: add display stack from i.MX downstream kernel

Import the display stack from the NXP vendor kernel tree to
allow easy testing of the upstream panthor driver with the
Mali G310 GPU inside of the i.MX95.

Compared to the vendor kernel tree a few fixes have been
applied to get the code building:

 * platform driver's remove function now return void instead of int
 * drm_fbdev_dma_setup() got dropped
 * DMA namespace must be imported

Co-Developed-by: Guangliu Ding <guangliu.ding@nxp.com>
Co-Developed-by: Liu Ying <victor.liu@nxp.com>
Co-Developed-by: Sandor Yu <Sandor.yu@nxp.com>
Signed-off-by: Guangliu Ding <guangliu.ding@nxp.com>
Signed-off-by: Liu Ying <victor.liu@nxp.com>
Signed-off-by: Sandor Yu <Sandor.yu@nxp.com>
Signed-off-by: Sebastian Reichel <sebastian.reichel@collabora.com>

fix build issues

Signed-off-by: Sebastian Reichel <sebastian.reichel@collabora.com>