stm32/extint: Remove unused (and incorrect) EXTI defines.

ports/stm32/extint.h

@@ -59,13 +59,6 @@
 
 #define EXTI_NUM_VECTORS        (PYB_EXTI_NUM_VECTORS)
 
-#define EXTI_MODE_INTERRUPT     (offsetof(EXTI_TypeDef, IMR))
-#define EXTI_MODE_EVENT         (offsetof(EXTI_TypeDef, EMR))
-
-#define EXTI_TRIGGER_RISING         (offsetof(EXTI_TypeDef, RTSR))
-#define EXTI_TRIGGER_FALLING        (offsetof(EXTI_TypeDef, FTSR))
-#define EXTI_TRIGGER_RISING_FALLING (EXTI_TRIGGER_RISING + EXTI_TRIGGER_FALLING)  // just different from RISING or FALLING
-
 void extint_init0(void);
 
 uint extint_register(mp_obj_t pin_obj, uint32_t mode, uint32_t pull, mp_obj_t callback_obj, bool override_callback_obj);