[kernel] RT_NAME_MAX set the range from 1

RT_NAME_MAX为0是nano中使用，完整版中不支持const name

src/Kconfig

@@ -3,12 +3,11 @@ menu "RT-Thread Kernel"
 
 config RT_NAME_MAX
     int "The maximal size of kernel object name"
-    range 0 64
+    range 1 64
     default 8
     help
         Each kernel object, such as thread, timer, semaphore etc, has a name,
         the RT_NAME_MAX is the maximal size of this object name.
-        If RT_NAME_MAX sets as 0, the name will be const.
 
 config RT_USING_ARCH_DATA_TYPE
     bool "Use the data types defined in ARCH_CPU"