hammerhead: update prebuilt kernel

0b315ef net/l2tp: don't fall back on UDP [get|set]sockopt

Bug: 16356364
Change-Id: I44250989b7b7e0ddb002285275542aaf74612b31
diff --git a/zImage-dtb b/zImage-dtb
index 225140c..1991949 100644
--- a/zImage-dtb
+++ b/zImage-dtb
Binary files differ