ANDROID: add script to fetch android kernel config fragments

The Android kernel config fragments now live in a separate repository.
To prevent others from having to search for this location, add a script
to fetch and unpack the fragments.

Update .gitignore to include these fragments.

Change-Id: If2d4a59b86e4573b0a9b3190025dfe4191870b46
Signed-off-by: Steve Muckle <smuckle@google.com>

.gitignore

@@ -132,3 +132,6 @@ all.config
 
 # Kdevelop4
 *.kdev4
+
+# fetched Android config fragments
+kernel/configs/android-*.cfg

kernel/configs/android-fetch-configs.sh

@@ -0,0 +1,4 @@
+#!/bin/sh
+
+curl https://android.googlesource.com/kernel/configs/+archive/master/android-4.9.tar.gz | tar xzv
+