fbcon: call fbcon_fb_(un)registered directly

With

commit 6104c37094e729f3d4ce65797002112735d49cd1
Author: Daniel Vetter <[email protected]>
Date:   Tue Aug 1 17:32:07 2017 +0200

    fbcon: Make fbcon a built-time depency for fbdev

we have a static dependency between fbcon and fbdev, and we can
replace the indirection through the notifier chain with a function
call.

v2: Sam Ravnborg noticed that mach-pxa/am200epd.c has a notifier too,
and listens to this.

...

Looking at the code it seems to wait for some fb to show up, so that
it can get the framebuffer base address from the fb_info struct. I
suspect his is some firmware fbdev. Then it uses that information to
let the real fbdev driver (metronomefb.c by the looks) get at the
framebuffer memory.

This doesn't looke like it's easy to fix (except by deleting the
entire thing, seems untouched since 2008, we might be able to get away
with that), so let's just stuff a few #ifdef into fb.h and fbmem.c and
cry over them for a bit.

Signed-off-by: Daniel Vetter <[email protected]>
Reviewed-by: Sam Ravnborg <[email protected]>
Reviewed-by: Maarten Lankhorst <[email protected]>
Cc: Bartlomiej Zolnierkiewicz <[email protected]>
Cc: Daniel Vetter <[email protected]>
Cc: Hans de Goede <[email protected]>
Cc: Greg Kroah-Hartman <[email protected]>
Cc: "Noralf Trønnes" <[email protected]>
Cc: Yisheng Xie <[email protected]>
Cc: Peter Rosin <[email protected]>
Cc: "Michał Mirosław" <[email protected]>
Cc: Thomas Zimmermann <[email protected]>
Cc: Mikulas Patocka <[email protected]>
Cc: [email protected]
Cc: Daniel Mack <[email protected]>
Cc: Haojian Zhuang <[email protected]>
Cc: Robert Jarzmik <[email protected]>
Cc: Konstantin Khorenko <[email protected]>
Cc: Prarit Bhargava <[email protected]>
Cc: Gerd Hoffmann <[email protected]>
Cc: Steve Sakoman <[email protected]>
Cc: Steve Sakoman <[email protected]>
Cc: [email protected]
Link: https://patchwork.freedesktop.org/patch/msgid/[email protected]

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