drm/sysfb: Add vesadrm for VESA displays

drm/sysfb: Add vesadrm for VESA displays

Add support for screen_info setups with VIDEO_TYPE_VLFB. Provide the
minimum functionality of reading modes, updating and clearing the display.

There is existing support for these displays provided by simpledrm with
CONFIG_SYSFB_SIMPLEFB=y. Using vesadrm over simpledrm will allow for the
use of additional functionality provided by VESA, such as EDID information,
gamma correction and palette modes. This enhances the user experience and
adds support for more display configuratons.

v4:
- depend on CONFIG_X86
v3:
- depend on !SYSFB_SIMPLEFB (Javier)

Signed-off-by: Thomas Zimmermann <tzimmermann@suse.de>
Reviewed-by: Javier Martinez Canillas <javierm@redhat.com>
Link: https://lore.kernel.org/r/20250401094056.32904-17-tzimmermann@suse.de