Update git submodules

* Update docs/submodules/releng from branch 'master'
  - Merge "Fix SFC Email PTL Macro"
  - Fix SFC Email PTL Macro

    Includes the name of the PTL but should be just the email.

    Change-Id: If6ef3b7c15defd44c6f86a24d6250840c37dd24b
    Signed-off-by: Trevor Bramwell <tbramwell@linuxfoundation.org>

diff --git a/docs/submodules/releng b/docs/submodules/releng
index d63b623..484f164 160000 (submodule)
--- a/docs/submodules/releng
+++ b/docs/submodules/releng
@@ -1 +1 @@
-Subproject commit d63b62357077891d9395d351fd85e97d31ad87fc
+Subproject commit 484f16485ab96a5321d0aecb90c0e9511978589f