drivers: minimize additional I2C retries

src/drivers/lights/rgbled/rgbled.cpp

@@ -134,25 +134,13 @@ RGBLED::probe()
 	bool on, powersave;
 	uint8_t r, g, b;
 
-	/**
-	   this may look strange, but is needed. There is a serial
-	   EEPROM (Microchip-24aa01) that responds to a bunch of I2C
-	   addresses, including the 0x55 used by this LED device. So
-	   we need to do enough operations to be sure we are talking
-	   to the right device. These 3 operations seem to be enough,
-	   as the 3rd one consistently fails if no RGBLED is on the bus.
-	 */
-
-	unsigned prevretries = _retries;
-	_retries = 4;
-
 	if ((ret = get(on, powersave, r, g, b)) != OK ||
 	    (ret = send_led_enable(false) != OK) ||
 	    (ret = send_led_enable(false) != OK)) {
 		return ret;
 	}
 
-	_retries = prevretries;
+	_retries = 1;
 
 	return ret;
 }