update to current upstream revision

Signed-off-by: Thomas Lamprecht <t.lamprecht@proxmox.com>

diff --git a/edk2 b/edk2
index 5a56c0493955cf55e7eef96dbba815cfbb067d7d..68099b52b0fcc1d45864154954d776d91afb33e0 160000 (submodule)
--- a/edk2
+++ b/edk2
@@ -1 +1 @@
-Subproject commit 5a56c0493955cf55e7eef96dbba815cfbb067d7d
+Subproject commit 68099b52b0fcc1d45864154954d776d91afb33e0