dragon: Update prebuilt kernel to 85a9c92e15f94c5088bee5db03585705f206cdc3

Build: trybot-smaug-paladin/R48-7547.1.0-b609

Changes include:
* 85a9c92 CHROMIUM: ASoC: nau8825: Use TESTDAC to reduce start/stop playback plop

Change-Id: I93768e161329ab33b0ef8627112c67651c6e8d28
diff --git a/Image.fit b/Image.fit
index 12feb74..bc524a8 100644
--- a/Image.fit
+++ b/Image.fit
Binary files differ