fix(log): replace printf with fwrite to save the stack size (#2655)

Signed-off-by: Xiang Xiao <xiaoxiang@xiaomi.com>

src/misc/lv_log.c

@@ -98,7 +98,7 @@ void _lv_log_add(lv_log_level_t level, const char * file, int line, const char *
 void lv_log(const char * buf)
 {
 #if LV_LOG_PRINTF
-    printf("%s", buf);
+    fwrite(buf, 1, strlen(buf), stdout);
 #endif
     if(custom_print_cb) custom_print_cb(buf);