shamu: update prebuilt kernel

945416c mdss: mdp: add ioctl for secure configuration
6726177 arm/dt: aosp_shamu: move active config for Atmel touch to TDAT

Linux version 3.10.40-g945416c (android-build@vpbs1.mtv.corp.google.com) (gcc version 4.8 (GCC) ) #1 SMP PREEMPT Fri Oct 17 16:10:41 UTC 2014

Bug: 17957732
Change-Id: Ia021e822b49b268fa805defd458d34b12778632c