cpu/esp: move BACKUP* attributes to esp_common

cpu/esp32/include/cpu_conf.h

@@ -51,21 +51,9 @@ extern "C" {
  */
 #define PRINTF_BUFSIZ 256
 
-/**
- * @brief   Memory marked with this attribute is retained during deep sleep
- *          and initialized with 0 on cold boot.
- */
-#define BACKUP_RAM      __attribute__((section(".rtc.bss")))
-
-/**
- * @brief   Memory marked with this attribute is retained during deep sleep
- *          and initialized with user provided data on cold boot.
- */
-#define BACKUP_RAM_DATA __attribute__((section(".rtc.data")))
-
 #ifdef __cplusplus
 }
-#endif /* CPU_CONF_H */
+#endif
 
 #endif /* CPU_CONF_H */
 /** @} */

cpu/esp8266/include/periph_cpu.h

@@ -27,12 +27,6 @@
 extern "C" {
 #endif
 
-/**
- * @brief   Memory marked with this attribute is retained during deep sleep
- */
-#define BACKUP_RAM      __attribute__((section(".rtc.bss")))
-#define BACKUP_RAM_DATA __attribute__((section(".rtc.data")))
-
 /**
  * @brief   Length of the CPU_ID in octets
  */

cpu/esp_common/include/cpu_conf_common.h

@@ -32,6 +32,18 @@
 #define HAVE_HEAP_STATS
 #endif
 
+/**
+ * @brief   Memory marked with this attribute is retained during deep sleep
+ *          and initialized with 0 on cold boot.
+ */
+#define BACKUP_RAM      __attribute__((section(".rtc.bss")))
+
+/**
+ * @brief   Memory marked with this attribute is retained during deep sleep
+ *          and initialized with user provided data on cold boot.
+ */
+#define BACKUP_RAM_DATA __attribute__((section(".rtc.data")))
+
 #ifdef __cplusplus
 extern "C" {
 #endif