fbcon: Maintain a private array of fb_info

Accessing the one in fbmem.c without taking the right locks is a bad
idea. Instead maintain our own private copy, which is fully protected
by console_lock() (like everything else in fbcon.c). That copy is
serialized through fbcon_fb_registered/unregistered() calls.

Also this means we do not need to hold a full fb_info reference, which
is nice because doing so would mean a refcount loop between the
console and the fb_info. But it's also not nice since it means
console_lock() must be held absolutely everywhere. Well strictly
speaking we could still try to do some refcounting games again by
calling get_fb_info before we drop the console_lock. But things will
get tricky.

Acked-by: Sam Ravnborg <[email protected]>
Signed-off-by: Daniel Vetter <[email protected]>
Cc: Daniel Vetter <[email protected]>
Cc: Tetsuo Handa <[email protected]>
Cc: Claudio Suarez <[email protected]>
Cc: Du Cheng <[email protected]>
Cc: Greg Kroah-Hartman <[email protected]>
Link: https://patchwork.freedesktop.org/patch/msgid/[email protected]

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