drm: verisilicon: add a driver for Verisilicon display controllers

This is a from-scratch driver targeting Verisilicon DC-series display
controllers, which feature self-identification functionality like their
GC-series GPUs.

Only DC8200 is being supported now, and only the main framebuffer is set
up (as the DRM primary plane). Support for more DC models and more
features is my further targets.

As the display controller is delivered to SoC vendors as a whole part,
this driver does not use component framework and extra bridges inside a
SoC is expected to be implemented as dedicated bridges (this driver
properly supports bridge chaining).

Signed-off-by: Icenowy Zheng <uwu@icenowy.me>
Signed-off-by: Icenowy Zheng <zhengxingda@iscas.ac.cn>
Tested-by: Han Gao <gaohan@iscas.ac.cn>
Tested-by: Michal Wilczynski <m.wilczynski@samsung.com>
Reviewed-by: Thomas Zimmermann <tzimmermann@suse.de>
Signed-off-by: Thomas Zimmermann <tzimmermann@suse.de>
Link: https://patch.msgid.link/20260129023922.1527729-4-zhengxingda@iscas.ac.cn

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