fbdev/sysfs: Fix locking

fb_set_var requires we hold the fb_info lock. Or at least this now
matches what the ioctl does ...

Note that ps3fb and sh_mobile_lcdcfb are busted in different ways here,
but I will not fix them up.

Also in practice this isn't a big deal, because really variable fbdev
state is actually protected by console_lock (because fbcon just
doesn't bother with lock_fb_info() at all), and lock_fb_info
protecting anything is really just a neat lie. But that's a much
bigger fish to fry.

Acked-by: Thomas Zimmermann <[email protected]>
Acked-by: Sam Ravnborg <[email protected]>
Signed-off-by: Daniel Vetter <[email protected]>
Cc: Helge Deller <[email protected]>
Cc: Daniel Vetter <[email protected]>
Cc: Qing Wang <[email protected]>
Cc: Sam Ravnborg <[email protected]>
Link: https://patchwork.freedesktop.org/patch/msgid/[email protected]

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