Update git submodules

* Update docs/submodules/onosfw from branch 'master'
  - update onosfw docs

    Change-Id: Ia219a0574f54f79639596e4c12d735c3b9c803cc
    Signed-off-by: bobzhou <bob.zh@huawei.com>

diff --git a/docs/submodules/onosfw b/docs/submodules/onosfw
index cf40582..21d8aa7 160000 (submodule)
--- a/docs/submodules/onosfw
+++ b/docs/submodules/onosfw
@@ -1 +1 @@
-Subproject commit cf40582a83745837c66b68d501e13189e96615af
+Subproject commit 21d8aa7d969ea1aef71dd8611c914153b8a7904d