staging: r8188eu: core: remove power_saving_wk_hdl function

Remove function power_saving_wk_hdl is it just calling rtw_ps_processor.
Instead of power_saving_wk_hdl() call  rtw_ps_processor().

Acked-by: Michael Straube <straube.linux@gmail.com>
Signed-off-by: Saurav Girepunje <saurav.girepunje@gmail.com>
Link: https://lore.kernel.org/r/YVhv5JiHovfdpNGg@user


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