i2c: stm32f7: Use str_on_off() helper

Remove hard-coded strings by using the str_on_off() helper.

Signed-off-by: Yumeng Fang <fang.yumeng@zte.com.cn>
Acked-by: Alain Volmat <alain.volmat@foss.st.com>
Signed-off-by: Andi Shyti <andi.shyti@kernel.org>
Link: https://lore.kernel.org/r/20250623203144007kQF7E1Bhy5PJl-Ph3u3Ou@zte.com.cn

Author: Yumeng Fang

drivers/i2c/busses/i2c-stm32f7.c

@@ -34,6 +34,7 @@
 #include <linux/regmap.h>
 #include <linux/reset.h>
 #include <linux/slab.h>
+#include <linux/string_choices.h>
 
 #include "i2c-stm32.h"
 
@@ -722,7 +723,7 @@ static int stm32f7_i2c_setup_timing(struct stm32f7_i2c_dev *i2c_dev,
 	dev_dbg(i2c_dev->dev, "I2C Rise(%i) and Fall(%i) Time\n",
 		setup->rise_time, setup->fall_time);
 	dev_dbg(i2c_dev->dev, "I2C Analog Filter(%s), DNF(%i)\n",
-		(i2c_dev->analog_filter ? "On" : "Off"), i2c_dev->dnf);
+		str_on_off(i2c_dev->analog_filter), i2c_dev->dnf);
 
 	i2c_dev->bus_rate = setup->speed_freq;