hammerhead: update prebuilt kernel

fb9e85a msm: arm: krait: Patch for krait array access out of bound
1235eac net: wireless: bcmdhd: Add checks for stack buffer overflows

Linux version 3.4.0-gfb9e85a (android-build@vpef9.mtv.corp.google.com)
(gcc version 4.8 (GCC) ) #1 SMP PREEMPT Wed Dec 9 22:15:19 UTC 2015

Bug: 25661991
Bug: 25773204
Change-Id: Icb6a0989a12fe3ade4d47dacfaf69f1e632346d5
Signed-off-by: Yuan Lin <yualin@google.com>
diff --git a/zImage-dtb b/zImage-dtb
index dcfdc1c..bb5735a 100644
--- a/zImage-dtb
+++ b/zImage-dtb
Binary files differ