[driver/pipe] RT_UNAMED_PIPE_NUMBER add depends

components/drivers/Kconfig

@@ -13,6 +13,7 @@ config RT_USING_DEVICE_IPC
 
 config RT_UNAMED_PIPE_NUMBER
     int "The number of unamed pipe"
+    depends on RT_USING_DEVICE_IPC
     default 64
 
 if RT_USING_DEVICE_IPC