[dd][rtc] set the RTC alarm thread stack size default.

Signed-off-by: GuEe-GUI <[email protected]>

Author: GuEe-GUI

components/drivers/rtc/Kconfig

@@ -10,7 +10,7 @@ config RT_USING_RTC
         if RT_USING_ALARM
             config RT_ALARM_STACK_SIZE
                 int "stack size for alarm thread"
-                default 2048
+                default IDLE_THREAD_STACK_SIZE
 
             config RT_ALARM_TIMESLICE
                 int "timeslice for alarm thread"