remove dead i2c overclock code

src/main/drivers/bus_i2c_hal.c

@@ -201,12 +201,6 @@ void I2C4_EV_IRQHandler(void)
 
 static volatile uint16_t i2cErrorCount = 0;
 
-static bool i2cOverClock;
-
-void i2cSetOverclock(uint8_t OverClock) {
-    i2cOverClock = (OverClock) ? true : false;
-}
-
 static bool i2cHandleHardwareFailure(I2CDevice device)
 {
     (void)device;

src/main/fc/init.c

@@ -424,8 +424,6 @@ void init(void)
     }
 #endif
 
-    //i2cSetOverclock(masterConfig.i2c_overclock);
-
     debugMode = systemConfig()->debug_mode;
 
 #ifdef TARGET_PREINIT