Update git submodules

* Update docs/submodules/pharos from branch 'master'
  - Fix daisy gateway generated by PDF

    Fixed_ips were removed from the PDF. So we need get gateway address
    from the 'interfaces'.

    Change-Id: Ie6adbf4ef3cbde05bb2fb114a58395dda8ae50fb
    Signed-off-by: Alex Yang <yangyang1@zte.com.cn>

diff --git a/docs/submodules/pharos b/docs/submodules/pharos
index 6233ce9..4fa51a5 160000 (submodule)
--- a/docs/submodules/pharos
+++ b/docs/submodules/pharos
@@ -1 +1 @@
-Subproject commit 6233ce9048958f19f31ac07f9c88309591590b7f
+Subproject commit 4fa51a5326547b59bef35e162729e44f3c1aec3a