drm/fbdev: Move fbdev helpers into client library

DRM's fbdev helpers are for the fbdev-emulation clients. Move them
into the client-library module. Fix include statements throughout
DRM drivers.

While at it, rename the files from drm_fb_helper to drm_fbdev_helper.
The old name was too reminiscent of DRM's framebuffer code.

The GEM support code for fbdev remains part of DRM's memory managers.

v4:
- fix the depedendencies from v3
v3:
- remove obsolete dependencies from Kconfig
v2:
- update armada und docs

Signed-off-by: Thomas Zimmermann <tzimmermann@suse.de>
Reviewed-by: Alex Deucher <alexander.deucher@amd.com>
Acked-by: Jani Nikula <jani.nikula@intel.com>
Reviewed-by: Javier Martinez Canillas <javierm@redhat.com>
Link: https://patch.msgid.link/20260928080323.23909-3-tzimmermann@suse.de

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