Draft: DRM: Add support of AI Processor Unit (APU)

Many AI Processur Unit (APU) have a similar architecture. This driver intends helping supporting them. This relies on DRM and provides some abstractions useful for AI accelerators. Currently, this provides the infrastructure to alloc an APU device and register one or many cores. The driver will takes care to register itself to DRM.

Signed-off-by: Alexandre Bailon abailon@baylibre.com Reviewed-by: Julien Stephan jstephan@baylibre.com