cm: charger: Export the RTC Clock and Alarm timestamps

* Gives easy access to the RTC values in order to verify or debug
    the current status of the RTC clock and alarm, for example
    if a user says powered-off alarm doesn't work

Change-Id: I47e71433a53a25fe9880e7be6a1f5bdb1105ef78

charger/healthd_board_cm.cpp

@@ -258,10 +258,12 @@ static void *alarm_thread(void *)
      * set by user
      */
     rc = alarm_get_time(ALARM_TIME, &alm_secs);
+    LOGI("RTC Alarm %ld\n", alm_secs);
     if (rc < 0 || !alm_secs)
         goto err;
 
     rc = alarm_get_time(RTC_TIME, &rtc_secs);
+    LOGI("RTC Clock %ld\n", rtc_secs);
     if (rc < 0)
         goto err;