Revert "hammerhead: update prebuilt kernel."

This reverts commit 91ec0acc18c8e74f72ba877d16244940ad47fe91.

Change-Id: I63fed6635e750b0a9aaf0dea789bade1342a5b16
diff --git a/zImage-dtb b/zImage-dtb
index 41b06c7..c5f0a83 100644
--- a/zImage-dtb
+++ b/zImage-dtb
Binary files differ