Remove obsolete code.

radio/src/hal/serial_port.h

@@ -23,8 +23,6 @@
 
 #include "serial_driver.h"
 
-typedef void etx_pwr_driver;
-
 typedef struct {
     const char*                name;
     const etx_serial_driver_t* uart;

radio/src/serial.cpp

@@ -110,7 +110,6 @@ static bool getSerialPower(uint8_t port_nr)
 struct SerialPortState
 {
   uint8_t                  mode;
-  bool                     power;
   const etx_serial_port_t* port;
   void*                    usart_ctx;
 };