shamu: update prebuilt kernel

8ac8975 net: wireless: bcmdhd abort ongoing-scan for disconnection
7247ba7 net: ipv6: allow choosing optimistic addresses with use_optimistic

Linux version 3.10.40-g8ac8975 (android-build@vpbs1.mtv.corp.google.com) (gcc version 4.8 (GCC) ) #1 SMP PREEMPT Tue Dec 9 23:07:29 UTC 2014

Bug: 17769720
Bug: 18609055
Bug: 18634452
Change-Id: I20a019adc6845c9f7bba5f099ece56e0d4e4a222
diff --git a/zImage-dtb b/zImage-dtb
index 910dbc1..ec259aa 100644
--- a/zImage-dtb
+++ b/zImage-dtb
Binary files differ