fbdev/vga16fb: Auto-generate module init/exit code

Move vgag16fb's option parsing into the driver's probe function and
generate the rest of the module's init/exit functions from macros.
Keep the options code, although there are no options defined.

v2:
	* no options are supported, remove the code (Javier)

Signed-off-by: Thomas Zimmermann <tzimmermann@suse.de>
Reviewed-by: Javier Martinez Canillas <javierm@redhat.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20220718072322.8927-4-tzimmermann@suse.de