Updates hydra: bbca674 Upgrade: do not run rpi-update

diff --git a/hydra b/hydra
index ef8aeb50e0d2697c5217fdf0149999b179ece4c6..bbca67466c58b6496cf2764103441b77a93288f4 160000 (submodule)
--- a/hydra
+++ b/hydra
@@ -1 +1 @@
-Subproject commit ef8aeb50e0d2697c5217fdf0149999b179ece4c6
+Subproject commit bbca67466c58b6496cf2764103441b77a93288f4