boards/avsextrem: remove unused PWM defines

boards/avsextrem/include/periph_conf.h

@@ -41,26 +41,6 @@ extern "C" {
 #define TIMER_NUMOF         (1U)
 /** @} */
 
-/**
- * @brief PWM device and pinout configuration
- */
-#define PWM_NUMOF           (0)         /* disable PWM for now as no pins are specified */
-#define PWM_0_EN            (0)
-
-/* PWM_0 device configuration */
-#define PWM_0_CH0           (3)         /* TODO: adjust pins for avsextrem */
-#define PWM_0_CH0_MR        PWM1MR3
-#define PWM_0_CH1           (4)
-#define PWM_0_CH1_MR        PWM1MR4
-#define PWM_0_CH2           (5)
-#define PWM_0_CH2_MR        PWM1MR5
-/* PWM_0 pin configuration */
-#define PWM_0_PORT          PINSEL4
-#define PWM_0_CH0_PIN       (2)
-#define PWM_0_CH1_PIN       (3)
-#define PWM_0_CH2_PIN       (4)
-#define PWM_0_FUNC          (1)
-
 /**
  * @brief Real Time Clock configuration
  */