Remove dead code for chips other than 8723A

Signed-off-by: Larry Finger <Larry.Finger@lwfinger.net>
Remove dead code due to CONFIG_USE_USB_BUFFER_ALLOC_RX not defined

Signed-off-by: Larry Finger <Larry.Finger@lwfinger.net>
Remove trailing white space

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