drivers: can: stm32: Update enable driver help message

Updated "Tested on" statements in the help

Signed-off-by: Alexander Wachter <alexander.wachter@student.tugraz.at>

drivers/can/Kconfig.stm32

@@ -10,7 +10,8 @@ config CAN_STM32
 	bool "STM32 CAN Driver"
 	depends on SOC_FAMILY_STM32
 	help
-	  Enable STM32 CAN Driver (tested on stm32F0 series)
+	  Enable STM32 CAN Driver.
+	  Tested on stm32F0, stm32L4 and stm32F7 series.
 
 config CAN_MAX_FILTER
 	int "Maximum number of concurrent active filters"