Update git submodules

* Update docs/submodules/releng-xci from branch 'master'
  - Merge "Increase ram of XCI VM and change disk cache type for all VMs"
  - Increase ram of XCI VM and change disk cache type for all VMs

    These options seem to help with the functest execution
    within XCI VM.

    Change-Id: I3b9b6b02fc571feb42543025f8ab179c6db18e0a
    Signed-off-by: Fatih Degirmenci <fdegir@gmail.com>

diff --git a/docs/submodules/releng-xci b/docs/submodules/releng-xci
index 8b9a73d..cf2cd4e 160000 (submodule)
--- a/docs/submodules/releng-xci
+++ b/docs/submodules/releng-xci
@@ -1 +1 @@
-Subproject commit 8b9a73d7fbc9bf6112b7efbbb2ad7f3216837ba4
+Subproject commit cf2cd4e4b87a5e392bc4ba49749a349925ba2f86