packages: We no longer depend on the open source atheros firmware

Change-Id: I599ada734b94492c455775b1b0c71d37b687dc0d
diff --git a/preamble.mk b/preamble.mk
index a52608e..a909fe3 100644
--- a/preamble.mk
+++ b/preamble.mk
@@ -66,7 +66,6 @@
 	doc-debian \
 	ethtool \
 	file \
-	firmware-atheros \
 	gettext-base \
 	gnupg \
 	hdparm \