Update git submodules

* Update docs/submodules/apex from branch 'master'
  - Merge "Updates the real time kvm kernel"
  - Updates the real time kvm kernel

    Reduce the real time kvm kernel by stripping debug info.

    Change-Id: I33335b8a9bd241ee83bc6f30bb2e819403bad491
    Signed-off-by: davidjchou <david.j.chou@intel.com>

diff --git a/docs/submodules/apex b/docs/submodules/apex
index 78a6e38..9c79fb8 160000 (submodule)
--- a/docs/submodules/apex
+++ b/docs/submodules/apex
@@ -1 +1 @@
-Subproject commit 78a6e3805d566f1061808fc62ea1e3f470e02c2d
+Subproject commit 9c79fb8cfef2a018252229f347d541815e976a15