chore: sdk compiles almost w/o warnings?

lib/amb1_sdk/common/mbed/hal/rtc_api.h

@@ -32,6 +32,8 @@
 extern "C" {
 #endif
 
+extern void RTC_ClokSource(u32 Source);
+
 /** @addtogroup rtc RTC
  *  @ingroup    hal
  *  @brief      rtc functions
@@ -47,10 +49,10 @@ extern "C" {
 typedef void (*alarm_irq_handler)(void);
 
 struct alarm_s {
-	uint32_t yday;//which day of the year
-	uint32_t hour;
-	uint32_t min;
-	uint32_t sec;
+  uint32_t sec;  /* Seconds */
+  uint32_t min;  /* Minutes */
+  uint32_t hour; /* Hours */
+  uint32_t yday; /* Day of year */
 };
 
 typedef struct alarm_s alarm_t;
@@ -123,6 +125,11 @@ void rtc_disable_alarm(void);
 ///@}
 #endif //CONFIG_PLATFORM_8711B || CONFIG_PLATFORM_8195BLP || CONFIG_PLATFORM_8721D || CONFIG_PLATFORM_8710C
 
+/**
+ * @brief Backup RTC time information before system reset
+ */
+void rtc_backup_timeinfo(void);
+
 /*\@}*/
 
 #ifdef __cplusplus