Sub: Move from micros() to AP_HAL::micros()

AP_HAL::micros() is a more common style around the rest of the project

Signed-off-by: Patrick José Pereira <patrickelectric@gmail.com>

ArduSub/Parameters.cpp

@@ -677,10 +677,10 @@ void Sub::load_parameters(void)
         hal.console->println("done.");
     }
 
-    uint32_t before = micros();
+    uint32_t before = AP_HAL::micros();
     // Load all auto-loaded EEPROM variables
     AP_Param::load_all();
-    hal.console->printf("load_all took %uus\n", (unsigned)(micros() - before));
+    hal.console->printf("load_all took %uus\n", (unsigned)(AP_HAL::micros() - before));
     AP_Param::convert_old_parameters(&conversion_table[0], ARRAY_SIZE(conversion_table));
 
     AP_Param::set_frame_type_flags(AP_PARAM_FRAME_SUB);

ArduSub/Sub.h

@@ -723,5 +723,3 @@ public:
 
 extern const AP_HAL::HAL& hal;
 extern Sub sub;
-
-using AP_HAL::micros;

ArduSub/failsafe.cpp

@@ -14,7 +14,7 @@ static bool in_failsafe;
 void Sub::mainloop_failsafe_enable()
 {
     failsafe_enabled = true;
-    failsafe_last_timestamp = micros();
+    failsafe_last_timestamp = AP_HAL::micros();
 }
 
 // Disable mainloop lockup failsafe