Update git submodules

* Update docs/submodules/releng from branch 'master'
  - xci: Switch to freestyle for xci-verify jobs

    Change-Id: I0e1d922ec303bf71e0683b624c51a254da0b9c88
    Signed-off-by: Fatih Degirmenci <fatih.degirmenci@ericsson.com>

diff --git a/docs/submodules/releng b/docs/submodules/releng
index 21cbe33..b6da25c 160000 (submodule)
--- a/docs/submodules/releng
+++ b/docs/submodules/releng
@@ -1 +1 @@
-Subproject commit 21cbe335c3757a11d3c5b598b9f6cbedd1585fac
+Subproject commit b6da25ca092390f5c8819cb21b168d85c848f765