hammerhead: update prebuilt kernel

Commit correct zImage-dtb to match the vmlinux.

Bug: 10040765
Change-Id: Id69b6835c4587f757dc2a2e0d9d79978add50b7d
diff --git a/zImage-dtb b/zImage-dtb
index 948ee6e..0efc1d3 100644
--- a/zImage-dtb
+++ b/zImage-dtb
Binary files differ