add .lcovrc file

Add missing coverage configuration file.

Change-Id: I551cb2fe29fd00e7a4bc6876fd7a64f456a0c513
Signed-off-by: Patrick Venture <venture@google.com>
diff --git a/.lcovrc b/.lcovrc
new file mode 100644
index 0000000..360a8b4
--- /dev/null
+++ b/.lcovrc
@@ -0,0 +1,3 @@
+geninfo_gcov_all_blocks = 1
+lcov_function_coverage = 1
+lcov_branch_coverage = 0