rtl8723au: Remove CONFIG_LAYER2_ROAMING_RESUME

This vaiable is always selected.

Signed-off-by: Larry Finger <Larry.Finger@lwfinger.net>
rtl8723au: Remove CONFIG_LAYER2_ROAMING

This variable is always selected.

Signed-off-by: Larry Finger <Larry.Finger@lwfinger.net>
rtl8723au: Remove CONFIG_TDLS

This option is not selected. Removing this code also allows include/rtw_tdls.h
and core/rtw_tdls.c to be deleted.

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