hammerhead: update prebuilt kernel

0315133 ipv4: Missing sk_nulls_node_init() in ping_unhash().
d1a8ffb Add build.config

Linux version 3.4.0-g0315133 (android-build@wpiy2.hot.corp.google.com)
(gcc version 4.8 (GCC) ) #1 SMP PREEMPT Tue Jul 28 17:54:37 UTC 2015

Bug: 19661035
Bug: 20770158
Change-Id: I895aaa59c7a6ed9b5a77c954aac98c2bb72ecd25
Signed-off-by: Thierry Strudel <tstrudel@google.com>
diff --git a/zImage-dtb b/zImage-dtb
index 027a5f5..be91bfc 100755
--- a/zImage-dtb
+++ b/zImage-dtb
Binary files differ