staging: r8188eu: remove rtw_ies_remove_ie()

Function rtw_ies_remove_ie() is not used, remove it. It is the only
user of rtw_get_ie_ex(), remove that function as well.

Signed-off-by: Michael Straube <straube.linux@gmail.com>
Link: https://lore.kernel.org/r/20210922200420.9693-38-straube.linux@gmail.com


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