hammerhead: update prebuilt kernel

1ac4805 msm: kgsl: Check the return value of _kgsl_context_get()
8f91650 msm: kgsl: fix a race condition when calling kref_put
869eb0e kref: Implement kref_get_unless_zero v3

Change-Id: I9baba93c3ff602558e3a00b2320d23f9ef0de0bf
2 files changed
tree: eee2814b1cbbca9a11dff7a9142c54a7b2633d72
  1. vmlinux
  2. zImage-dtb