cpu/sam0_common: move PWM to common code

cpu/sam0_common/include/periph_cpu_common.h

@@ -212,6 +212,24 @@ typedef struct {
     uint8_t gclk_src;       /**< GCLK source which supplys SERCOM */
 } uart_conf_t;
 
+/**
+ * @brief   PWM channel configuration data structure
+ */
+typedef struct {
+    gpio_t pin;                 /**< GPIO pin */
+    gpio_mux_t mux;             /**< pin function multiplex value */
+    uint8_t chan;               /**< TCC channel to use */
+} pwm_conf_chan_t;
+
+/**
+ * @brief   PWM device configuration data structure
+ */
+typedef struct {
+    Tcc *dev;                   /**< TCC device to use */
+    const pwm_conf_chan_t *chan;/**< channel configuration */
+    const uint8_t chan_numof;   /**< number of channels */
+} pwm_conf_t;
+
 /**
  * @brief   Available values for SERCOM SPI MISO pad selection
  */

cpu/samd21/include/periph_cpu.h

@@ -70,24 +70,6 @@ enum {
  */
 #define SPI_HWCS(x)     (UINT_MAX - 1)
 
-/**
- * @brief   PWM channel configuration data structure
- */
-typedef struct {
-    gpio_t pin;                 /**< GPIO pin */
-    gpio_mux_t mux;             /**< pin function multiplex value */
-    uint8_t chan;               /**< TCC channel to use */
-} pwm_conf_chan_t;
-
-/**
- * @brief   PWM device configuration data structure
- */
-typedef struct {
-    Tcc *dev;                   /**< TCC device to use */
-    const pwm_conf_chan_t *chan;/**< channel configuration */
-    const uint8_t chan_numof;   /**< number of channels */
-} pwm_conf_t;
-
 /**
  * @brief   Return the numeric id of a SERCOM device derived from its address
  *