auxdisplay/cfag12864bfb: Set FBINFO_VIRTFB flag
The cfag12864bfb driver operates on system memory. Mark the framebuffer
accordingly. Helpers operating on the framebuffer memory will test for
the presence of this flag.
Signed-off-by: Thomas Zimmermann <tzimmermann@suse.de>
Cc: Miguel Ojeda <ojeda@kernel.org>
Reviewed-by: Javier Martinez Canillas <javierm@redhat.com>
Acked-by: Miguel Ojeda <ojeda@kernel.org>
Link: https://patchwork.freedesktop.org/patch/msgid/20231127131655.4020-8-tzimmermann@suse.de