Update git submodules

* Update docs/submodules/stor4nfv from branch 'master'
  - Merge "support deploying etcd on aarch64 platform"
  - support deploying etcd on aarch64 platform

    Change-Id: I8d6e2c3255e81d95e0546169f24c9090b34ce0b6
    Signed-off-by: Di Xu <di.xu@arm.com>

diff --git a/docs/submodules/stor4nfv b/docs/submodules/stor4nfv
index ea3c10e..f54e4aa 160000 (submodule)
--- a/docs/submodules/stor4nfv
+++ b/docs/submodules/stor4nfv
@@ -1 +1 @@
-Subproject commit ea3c10e5533ae4bdbb3fc449e3baf2eb256b2ae3
+Subproject commit f54e4aa4fd49b0d0beef8730dc6357e2407fd42f