hammerhead: update prebuilt kernel

3a381a8 klist: del waiter from klist_remove_waiters before wakeup waitting process
4ca6ec5 Revert "drivers/staging: msm8610: Reduce android log buffer sizes"
04ff16e hammerhead_defconfig: auto-generated by 'make savedefconfig'

Change-Id: I0cbb6a54283d634faa34898872a50808321268b0