marlin: update prebuilt kernel [ DO NOT MERGE ANYWHERE ]

b976b26 arm64: dts: marlin: modify USB2.0 phy settings

Linux version 3.18.31-gb976b26 (android-build@vpeb5.mtv.corp.google.com)
(gcc version 4.9.x-google 20140827 (prerelease) (GCC) )
 #1 SMP PREEMPT Thu Sep 8 23:21:56 UTC 2016 ( ndr-factoryrom )

Bug: 31206266
Change-Id: I8478b9800b6c49398555c75bd431e27c9eac16f1
Source-Branch: android-msm-marlin-3.18-ndr-factoryrom
Signed-off-by: Yueyao (Nathan) Zhu <yueyao@google.com>
(cherry picked from commit ac55402c1964716400604e6489e149299e6c9c87)
diff --git a/Image.gz-dtb b/Image.gz-dtb
index 058b117..7c44866 100644
--- a/Image.gz-dtb
+++ b/Image.gz-dtb
Binary files differ