Roll back incorrectly updated prebuilts submodule.

This was accidentally updated in
https://hafnium-review.googlesource.com/c/hafnium/+/9401, and breaks
cloning in some cases.

Change-Id: Ia176c51e386837d9eab48f58d8c1598f07d52e37
diff --git a/prebuilts b/prebuilts
index 2498939..ce0ff4e 160000
--- a/prebuilts
+++ b/prebuilts
@@ -1 +1 @@
-Subproject commit 24989398059599c1d8e0c387779e910394c16637
+Subproject commit ce0ff4e3bb78d04d52f4717233706431055d0710