Revert "backlight/fbcon: Add FB_EVENT_CONBLANK"

This reverts commit 994efacdf9a087b52f71e620b58dfa526b0cf928.

The justification is that if hw blanking fails (i.e. fbops->fb_blank)
fails, then we still want to shut down the backlight. Which is exactly
_not_ what fb_blank() does and so rather inconsistent if we end up
with different behaviour between fbcon and direct fbdev usage. Given
that the entire notifier maze is getting in the way anyway I figured
it's simplest to revert this not well justified commit.

v2: Add static inline to the dummy version.

Cc: Richard Purdie <[email protected]>
Signed-off-by: Daniel Vetter <[email protected]>
Reviewed-by: Sam Ravnborg <[email protected]>
Reviewed-by: Maarten Lankhorst <[email protected]>
Acked-by: Daniel Thompson <[email protected]>
Cc: Lee Jones <[email protected]>
Cc: Daniel Thompson <[email protected]>
Cc: Jingoo Han <[email protected]>
Cc: Bartlomiej Zolnierkiewicz <[email protected]>
Cc: Daniel Vetter <[email protected]>
Cc: Hans de Goede <[email protected]>
Cc: Yisheng Xie <[email protected]>
Cc: [email protected]
Link: https://patchwork.freedesktop.org/patch/msgid/[email protected]

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