HAL_Empty: fix ambiguity of UARTDriver with the one defined in ChibiOS

libraries/AP_HAL_Empty/UARTDriver.cpp

@@ -1,27 +1,25 @@
 
 #include "UARTDriver.h"
 
-using namespace Empty;
+Empty::UARTDriver::UARTDriver() {}
 
-UARTDriver::UARTDriver() {}
+void Empty::UARTDriver::begin(uint32_t b) {}
-
+void Empty::UARTDriver::begin(uint32_t b, uint16_t rxS, uint16_t txS) {}
-void UARTDriver::begin(uint32_t b) {}
+void Empty::UARTDriver::end() {}
-void UARTDriver::begin(uint32_t b, uint16_t rxS, uint16_t txS) {}
+void Empty::UARTDriver::flush() {}
-void UARTDriver::end() {}
+bool Empty::UARTDriver::is_initialized() { return false; }
-void UARTDriver::flush() {}
+void Empty::UARTDriver::set_blocking_writes(bool blocking) {}
-bool UARTDriver::is_initialized() { return false; }
+bool Empty::UARTDriver::tx_pending() { return false; }
-void UARTDriver::set_blocking_writes(bool blocking) {}
-bool UARTDriver::tx_pending() { return false; }
 
 /* Empty implementations of Stream virtual methods */
-uint32_t UARTDriver::available() { return 0; }
+uint32_t Empty::UARTDriver::available() { return 0; }
-uint32_t UARTDriver::txspace() { return 1; }
+uint32_t Empty::UARTDriver::txspace() { return 1; }
-int16_t UARTDriver::read() { return -1; }
+int16_t Empty::UARTDriver::read() { return -1; }
 
 /* Empty implementations of Print virtual methods */
-size_t UARTDriver::write(uint8_t c) { return 0; }
+size_t Empty::UARTDriver::write(uint8_t c) { return 0; }
 
-size_t UARTDriver::write(const uint8_t *buffer, size_t size)
+size_t Empty::UARTDriver::write(const uint8_t *buffer, size_t size)
 {
     size_t n = 0;
     while (size--) {