Revert "hammerhead: update prebuilt kernel"

This reverts commit 21b7a669ed50b1ff0423167f7fad8c9aedbc8c02.

Change-Id: Ie8cc376ea64f371a9e522440792c7d07cf470b5f
diff --git a/vmlinux.bz2 b/vmlinux.bz2
index 1af88da..a169318 100644
--- a/vmlinux.bz2
+++ b/vmlinux.bz2
Binary files differ
diff --git a/zImage-dtb b/zImage-dtb
index 78ef8e5..7b9c3c5 100644
--- a/zImage-dtb
+++ b/zImage-dtb
Binary files differ