rtl8723au: Remove more IS_HARDWARE_TYPE_XXX macro usage

Signed-off-by: Larry Finger <Larry.Finger@lwfinger.net>
rtl8723au: Remove more IS_HARDWARE_TYPE_XXX garbage

Signed-off-by: Larry Finger <Larry.Finger@lwfinger.net>
rtl8723au: Finish removing IS_HARDWARE_TYPE_XXX macros

This driver supports only RTL8723AU devices.

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