Update git submodules

* Update docs/submodules/releng-xci from branch 'master'
  - Force remove ~/.vbmc folder in case if it doesn't exist

    Change-Id: If87afa892a0c39d082cb1563e1c019f46b742169
    Signed-off-by: Fatih Degirmenci <fdegir@gmail.com>

diff --git a/docs/submodules/releng-xci b/docs/submodules/releng-xci
index 8d00a12..53af7d3 160000 (submodule)
--- a/docs/submodules/releng-xci
+++ b/docs/submodules/releng-xci
@@ -1 +1 @@
-Subproject commit 8d00a12b591028e57037dee8a7d598f8f155d421
+Subproject commit 53af7d33d81298017de732594cc3088b2f5fbeef