leds: backlight: turn off on BL_CORE_FBBLANK too

This is the flag used by backlicht_disable().

Signed-off-by: Guido Günther <guido.gunther@puri.sm>
1 job for backport/5.3-nwl+mxsfb in 16 minutes and 34 seconds (queued for 2 seconds)
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