dragon: Update prebuilt kernel to 7d9ed63d448e60e13ac85d36d15882b13ba11018

Build: trybot-smaug-paladin/R49-7731.1.0-b662

Changes include:
* 7d9ed63 ANDROID: bcmdhd: Validate event packet size
* c3dc686 ANDROID: bcmdhd: Add checks for stack buffer overflows

Change-Id: I36aa45628d43ffbb22fb26a44d91552b87bff84b
diff --git a/Image.fit b/Image.fit
index be876ec..2c59916 100644
--- a/Image.fit
+++ b/Image.fit
Binary files differ