Remove probe override for si7210 driver

This commit removes the probe override for the si7210 driver, which seems to help with improving reliability of driver startup

src/drivers/si7210/si7210.cpp

@@ -42,19 +42,6 @@
 
 using namespace time_literals;
 
-int
-SI7210::probe()
-{
-	bool require_initialization = !init_si7210();
-
-	if (require_initialization && _keep_retrying) {
-		PX4_INFO("no sensor found, but will keep retrying");
-		return 0;
-	}
-
-	return require_initialization ? -1 : 0;
-}
-
 /* Get registers value */
 int
 SI7210::get_regs(uint8_t ptr, uint8_t *regs)

src/drivers/si7210/si7210.h

@@ -140,7 +140,6 @@ private:
 
 	int	measure() override { return 0; }
 	int	collect() override;
-	int	probe() override;
 	int	configure();
 
 	bool init_si7210();