HAL_Linux: fixed I2C get_device() interface

just stubs for now

libraries/AP_HAL_Linux/I2CDevice.cpp

@@ -344,7 +344,10 @@ I2CDeviceManager::get_device(std::vector<const char *> devpaths, uint8_t address
 }
 
 AP_HAL::OwnPtr<AP_HAL::I2CDevice>
-I2CDeviceManager::get_device(uint8_t bus, uint8_t address)
+I2CDeviceManager::get_device(uint8_t bus, uint8_t address,
+                             uint32_t bus_clock,
+                             bool use_smbus,
+                             uint32_t timeout_ms)
 {
     for (uint8_t i = 0, n = _buses.size(); i < n; i++) {
         if (_buses[i]->bus == bus) {

libraries/AP_HAL_Linux/I2CDevice.h

@@ -105,7 +105,10 @@ public:
             std::vector<const char *> devpaths, uint8_t address);
 
     /* AP_HAL::I2CDeviceManager implementation */
-    AP_HAL::OwnPtr<AP_HAL::I2CDevice> get_device(uint8_t bus, uint8_t address) override;
+    AP_HAL::OwnPtr<AP_HAL::I2CDevice> get_device(uint8_t bus, uint8_t address,
+                                                 uint32_t bus_clock=400000,
+                                                 bool use_smbus = false,
+                                                 uint32_t timeout_ms=4) override;
 
     /*
      * Stop all I2C threads and block until they are finalized. This doesn't