video: fbdev: Make *fb_setup() and *fb_init() static

The various *fb_setup() and *fb_init() functions are only used locally,
so they should be static.  Most of them do not need forward
declarations, so remove these where appropriate.

Signed-off-by: Geert Uytterhoeven <geert@linux-m68k.org>
Signed-off-by: Helge Deller <deller@gmx.de>