risc-v reduce use 128 bytes irq stack

board/QEMU_Spike/Src/main.c

@@ -14,11 +14,8 @@ void task1(void *pdata)
 	{
 		t1++;
 		share++;
-		//k_tick_t delay = tos_millisec2tick(10);
-		//tos_task_delay(delay);
-		tos_task_yield();
-		//osDelay(10);
-		//asm("wfi;");
+		tos_task_delay(2);
+		//tos_task_yield();
 	}
 }
 
@@ -29,9 +26,9 @@ void task2(void *pdata)
 	{
 		t2--;
 		share--;
-		//tos_task_delay(10);
-		tos_task_yield();
-		asm("wfi;");
+		tos_task_delay(3);
+		//tos_task_yield();
+		//asm("wfi;");
 	}
 }