staging: r8188eu: rfoff_reason is never initialised

rfoff_reason in struct pwrctrl_priv is never set, its value remains 0.

Remove rfoff_reason, related defines and a check in rtw_led_control
that is always false.

Signed-off-by: Martin Kaiser <martin@kaiser.cx>
Link: https://lore.kernel.org/r/20211226195556.159471-22-martin@kaiser.cx


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