dummycon: Sprinkle locking checks

As part of trying to understand the locking (or lack thereof) in the
fbcon/vt/fbdev maze, annotate everything.

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: Hans de Goede <[email protected]>
Cc: Daniel Vetter <[email protected]>
Cc: Greg Kroah-Hartman <[email protected]>
Cc: Kees Cook <[email protected]>
Cc: Nicolas Pitre <[email protected]>
Link: https://patchwork.freedesktop.org/patch/msgid/[email protected]

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