add "kservice optimization" option

src/Kconfig

@@ -116,10 +116,18 @@ config RT_TIMER_THREAD_STACK_SIZE
 
 endif
 
+menu "kservice optimization"
+
 config RT_KSERVICE_USING_STDLIB
     bool "Enable kservice to use standard C library"
     default n
 
+config RT_KSERVICE_USING_TINY_SIZE
+    bool "Enable kservice to use tiny size"
+    default n
+
+endmenu
+
 menuconfig RT_DEBUG
     bool "Enable debugging features"
     default y

src/kservice.c

@@ -126,7 +126,7 @@ RTM_EXPORT(_rt_errno);
  */
 RT_WEAK void *rt_memset(void *s, int c, rt_ubase_t count)
 {
-#ifdef RT_USING_TINY_SIZE
+#ifdef RT_KSERVICE_USING_TINY_SIZE
     char *xs = (char *)s;
 
     while (count--)
@@ -210,7 +210,7 @@ RTM_EXPORT(rt_memset);
  */
 RT_WEAK void *rt_memcpy(void *dst, const void *src, rt_ubase_t count)
 {
-#ifdef RT_USING_TINY_SIZE
+#ifdef RT_KSERVICE_USING_TINY_SIZE
     char *tmp = (char *)dst, *s = (char *)src;
     rt_ubase_t len;