Update git submodules

* Update plugins/gitiles from branch 'master'
  to 648b1df92b887ed5011e3a2fbf18fd2b9e8622b3
  - Support clone url type configuration
    
    Setting gerrit.cloneUrlType in the plugin config to change clone url
    type from default ssh (if ssh is enabled) to http or git.
    
    Change-Id: I120863e0829f6ec7aecd041fbdf87ed1228a8746
    
diff --git a/plugins/gitiles b/plugins/gitiles
index 44b5333..648b1df 160000
--- a/plugins/gitiles
+++ b/plugins/gitiles
@@ -1 +1 @@
-Subproject commit 44b5333d08d02c15334f81906134a5613d3f0a3b
+Subproject commit 648b1df92b887ed5011e3a2fbf18fd2b9e8622b3