Update git submodules

* Update docs/submodules/sfc from branch 'stable/danube'
  - Update release notes for Danube 3.0

    Change-Id: I5c4185c41b8baf3e243152b31322a326a07a5d5e
    Signed-off-by: Manuel Buil <mbuil@suse.com>
    (cherry picked from commit c444d00078d19bc5f0cd387213e78bdf6b3795bb)

diff --git a/docs/submodules/sfc b/docs/submodules/sfc
index 3c64135..f55aad7 160000 (submodule)
--- a/docs/submodules/sfc
+++ b/docs/submodules/sfc
@@ -1 +1 @@
-Subproject commit 3c6413555fa3fd67676d1265b41e138e96f7decc
+Subproject commit f55aad75a3ec1ef2da7daa723c1c1e99bb927f22