shamu: update prebuilt kernel

939e50f arm/dt: shamu: config uart6 to disable RX wakeup
571a10c msm_serial_hs: Fix for Rx wakeup disabled case
205726f net:wireless:bcmdhd disable watchdog thread

Bug: 16400463
diff --git a/zImage-dtb b/zImage-dtb
index 393e36e..c92a41c 100644
--- a/zImage-dtb
+++ b/zImage-dtb
Binary files differ