Update git submodules

* Update trusty/user/app/sample from branch 'master'
  to 7f5689885843d8308c1fef5c7e64bb1f077a8ee2
  - [hwkey] fix unit test that purports to derive a shared key, but does not
    
    Bug: None
    Change-Id: I0b70828edca5537cb601bdac7a1683065801e4a7
    
diff --git a/trusty/user/app/sample b/trusty/user/app/sample
index 4cc75f7..7f56898 160000
--- a/trusty/user/app/sample
+++ b/trusty/user/app/sample
@@ -1 +1 @@
-Subproject commit 4cc75f7a45693f18785b7c998404fcf9e8ea3c19
+Subproject commit 7f5689885843d8308c1fef5c7e64bb1f077a8ee2