Update git submodules

* Update docs/submodules/releng from branch 'master'
  - Merge "Add stable/fraser branch for pharos"
  - Add stable/fraser branch for pharos

    including: pharos and pharos-tools

    Change-Id: I08cef60fbd7ea86ba403ee0366329317ee016df4
    Signed-off-by: Julien <zhang.jun3g@zte.com.cn>

diff --git a/docs/submodules/releng b/docs/submodules/releng
index f331748..12648c2 160000 (submodule)
--- a/docs/submodules/releng
+++ b/docs/submodules/releng
@@ -1 +1 @@
-Subproject commit f331748f96b8ea8d78be5bc5718f1559f6bed4d3
+Subproject commit 12648c2b266f532571781ea80d044eabdc9ba538