staging: r8188eu: remove ap_sta_info_defer_update()

Function ap_sta_info_defer_update() is not used, remove it.

Signed-off-by: Michael Straube <straube.linux@gmail.com>
Link: https://lore.kernel.org/r/20210919153659.20826-2-straube.linux@gmail.com


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