rtl8723au: Remove dead code required for CONFIG_PCI_HCI

The driver is for USB.

Signed-off-by: Larry Finger <Larry.Finger@lwfinger.net>
rtl8723au: Remove dead code that depends on CONFIG_SDIO_HCI

Signed-off-by: Larry Finger <Larry.Finger@lwfinger.net>
rtl8723au: Remove dead code associated with CONFIG_GSPI_HCI

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

This parameter is always selected.

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