Update git submodules

* Update docs/submodules/onosfw from branch 'master'
  - add onos-sfc link update

    Change-Id: I1751feea6e8b7b0cf5dace4d53412a24a89f9dfb
    Signed-off-by: CNlucius <lukai1@huawei.com>

diff --git a/docs/submodules/onosfw b/docs/submodules/onosfw
index 2b80c8e..efeefab 160000 (submodule)
--- a/docs/submodules/onosfw
+++ b/docs/submodules/onosfw
@@ -1 +1 @@
-Subproject commit 2b80c8ea59398f0cd6df1fbc409589d9a861e686
+Subproject commit efeefab342b21329e28c342f31f1ccf3cb3ef8db