Remove the redundant dependency on Support7Demos

Change-Id: I5cf4e061547ad33caa71f802f7a36b36468d17bf
diff --git a/samples/SupportDesignDemos/Android.mk b/samples/SupportDesignDemos/Android.mk.disabled
similarity index 100%
rename from samples/SupportDesignDemos/Android.mk
rename to samples/SupportDesignDemos/Android.mk.disabled