Install dev-util/lcov again.

Since the dependency problem was resolved, we can now install it and use
it for generating coverage reports.

BUG=None
TEST=Builds dev-util/lcov

Change-Id: I02cc1aa8cedea3da1b985732f6fbb2d2ba58cf89
Reviewed-on: https://gerrit.chromium.org/gerrit/25544
Reviewed-by: Don Garrett <dgarrett@chromium.org>
Commit-Ready: Gilad Arnold <garnold@chromium.org>
Tested-by: Gilad Arnold <garnold@chromium.org>
diff --git a/setup_dev_packages b/setup_dev_packages
index ee5eb4f..4ea2069 100755
--- a/setup_dev_packages
+++ b/setup_dev_packages
@@ -17,7 +17,5 @@
   dev-cpp/gmock \
   dev-cpp/gtest \
   dev-util/bsdiff \
+  dev-util/lcov \
   sys-apps/rootdev
-
-# Doesn't work in the current sandbox
-#  dev-util/lcov \