drm/fbdev: Move fbdev module parameters next to module init

Define the parameters for fbdev emulation in the source file with the
module-initialization and exit code of drm_kms_helper.ko. The parameters
control some aspects of DRM's fbdev emulation. Common usage looks like

  drm_kms_helper.drm_fbdev_overalloc=200

on the kernel's command line. This has been possible for many years
and changing it would likely upset users.

The emulation code is supposed to be moved into the module for DRM
clients. Keeping the parameters in drm_kms_helper.ko avoids breaking
systems the use them in the way described above.

Signed-off-by: Thomas Zimmermann <tzimmermann@suse.de>
Reviewed-by: Alex Deucher <alexander.deucher@amd.com>
Reviewed-by: Javier Martinez Canillas <javierm@redhat.com>
Link: https://patch.msgid.link/20260928080323.23909-2-tzimmermann@suse.de

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