Update git submodules

* Update docs/submodules/dovetail from branch 'master'
  - Fix AArch64 nested Docker install

    Due to recent changes in official Dovetail Dockerfile,
    which is running on Ubuntu 14.04, we need some changes
    in our patch file for aarch64 in order to keep it working
    on 16.04.

    JIRA: ARMBAND-258

    Change-Id: Icff8c5a16d90ec4b67204a5b525a7896c796ca11
    Signed-off-by: Alexandru Nemes <alexandru.nemes@enea.com>

diff --git a/docs/submodules/dovetail b/docs/submodules/dovetail
index 0284a52..4a76e26 160000 (submodule)
--- a/docs/submodules/dovetail
+++ b/docs/submodules/dovetail
@@ -1 +1 @@
-Subproject commit 0284a52ccd2e9a5540e729083e1810e23df44c87
+Subproject commit 4a76e26451fca2df60778bee2a2b89aa908f9d76