Update git submodules

* Update docs/submodules/apex from branch 'stable/danube'
  - 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>
    (cherry picked from commit 557e2db49051721e1b70adc4a561a2c162b0c511)

diff --git a/docs/submodules/apex b/docs/submodules/apex
index e02b5be..05ab832 160000 (submodule)
--- a/docs/submodules/apex
+++ b/docs/submodules/apex
@@ -1 +1 @@
-Subproject commit e02b5be4ef2af55af0243dcd19ffac74fa7a052e
+Subproject commit 05ab832380db398a79bbc9b7bc28993175178346