Add "tags" to .gitignore file.

Signed-off-by: Po-Yu Chuang <ratbert@faraday-tech.com>
Signed-off-by: Wolfgang Denk <wd@denx.de>

.gitignore

@@ -54,6 +54,7 @@ series
 cscope.*
 
 # tags files
+/tags
 /ctags
 /etags