shamu: update prebuilt kernel

e0898d8 net: wireless: bcmdhd: Reduce scan dwell time to reduce power

b/17485849 Introduce Hammerhead's dwell time optimizations to Shamu/Volantis
Signed-off-by: Iliyan Malchev <malchev@google.com>

Change-Id: I37b11554b11c492e0dcc21bb8ffe894c747bfdd1
diff --git a/zImage-dtb b/zImage-dtb
index da6b8ce..141fd44 100644
--- a/zImage-dtb
+++ b/zImage-dtb
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