staging: r8188eu: remove LedStrategy from struct led_priv

LedStrategy is set but never used. Remove it from struct led_priv and
remove the now unused enum LED_STRATEGY_871x as well.

Signed-off-by: Michael Straube <straube.linux@gmail.com>
Link: https://lore.kernel.org/r/20210924204917.6313-6-straube.linux@gmail.com


Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>