hammerhead: update prebuilt kernel

6827f66 hammerhead: wifi: Support the MAC address written in hexadecimal
436028e arm/dt: hammerhead: JDI LCD default gamma register setting

Change-Id: I1d89f8ab0e4c0b6f1f3907157bf13ae062bc8096
diff --git a/kernel b/kernel
index a3894f4..36a3a3d 100644
--- a/kernel
+++ b/kernel
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