soc: stm32: Extended watchdog support to all series

STM32F2, STM32F7 and STM32L0 were missing wtachdog API support.
Fix this.

Signed-off-by: Erwan Gouriou <erwan.gouriou@linaro.org>

soc/arm/st_stm32/stm32f2/soc.h

@@ -46,6 +46,10 @@
 #include <stm32f2xx_ll_gpio.h>
 #endif
 
+#ifdef CONFIG_IWDG_STM32
+#include <stm32f2xx_ll_iwdg.h>
+#endif
+
 #endif /* !_ASMLANGUAGE */
 
 #endif /* _STM32F2_SOC_H_ */

soc/arm/st_stm32/stm32f7/soc.h

@@ -64,6 +64,10 @@
 #include <stm32f7xx_ll_gpio.h>
 #endif
 
+#ifdef CONFIG_IWDG_STM32
+#include <stm32f7xx_ll_iwdg.h>
+#endif
+
 #endif /* !_ASMLANGUAGE */
 
 #endif /* _STM32F7_SOC_H_ */

soc/arm/st_stm32/stm32l0/soc.h

@@ -56,6 +56,10 @@
 #include <stm32l0xx_ll_gpio.h>
 #endif
 
+#ifdef CONFIG_IWDG_STM32
+#include <stm32l0xx_ll_iwdg.h>
+#endif
+
 #endif /* !_ASMLANGUAGE */
 
 #endif /* _STM32L0_SOC_H_ */