build: enable code coverage

Enable code coverage for the project.  Valgrind not enabled in this
step.

Tested: Verified code coverage step now running.
Change-Id: Ieb3606e5ad741fb0dd181f8da594c18258efa6bc
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