rtl8192du: Remove configuration CONFIG_IOCTL_CFG80211

This one is always selected.

Signed-off-by: Larry Finger <Larry.Finger@lwfinger.net>
rtl8192du: Remove CONFIG_CFG80211_FORCE_COMPATIBLE_2_6_37_UNDER

This variable is always selected.

Signed-off-by: Larry Finger <Larry.Finger@lwfinger.net>