Update git submodules

* Update docs/submodules/apex from branch 'master'
  - Merge "Updating Linux kernel licensing info to GPL v2 with a new link"
  - Updating Linux kernel licensing info to GPL v2 with a new link

    Change-Id: I463a26299c9b76123b3c6d3374cd2ed391fcdc99
    Signed-off-by: Ray Paik <rpaik@linuxfoundation.org>

diff --git a/docs/submodules/apex b/docs/submodules/apex
index f88bfbc..b9f63d5 160000 (submodule)
--- a/docs/submodules/apex
+++ b/docs/submodules/apex
@@ -1 +1 @@
-Subproject commit f88bfbcb62c2a8b3de12a325482146d1118b39f7
+Subproject commit b9f63d58a83e18dd221be13348e585533eedcedc