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/test/Makefile.am b/test/Makefile.am
index 562de03..60d07e0 100644
--- a/test/Makefile.am
+++ b/test/Makefile.am
@@ -3,14 +3,20 @@
 	$(GTEST_CFLAGS) \
 	$(GMOCK_CFLAGS) \
 	$(SDBUSPLUS_CFLAGS) \
-	$(PHOSPHOR_DBUS_INTERFACES_CFLAGS)
+	$(PHOSPHOR_DBUS_INTERFACES_CFLAGS) \
+	$(CODE_COVERAGE_CPPFLAGS)
+AM_CFLAGS = \
+	$(CODE_COVERAGE_CFLAGS)
+AM_CXXFLAGS = \
+	$(CODE_COVERAGE_CXXFLAGS)
 AM_LDFLAGS = \
 	$(GTEST_LIBS) \
 	$(GMOCK_LIBS) \
 	-lgmock_main \
 	$(OESDK_TESTCASE_FLAGS) \
 	$(SDBUSPLUS_LIBS) \
-	$(PHOSPHOR_DBUS_INTERFACES_LIBS)
+	$(PHOSPHOR_DBUS_INTERFACES_LIBS) \
+	$(CODE_COVERAGE_LIBS)
 
 # Run all 'check' test programs
 check_PROGRAMS = hwmon_unittest fanpwm_unittest sensor_unittest