qcacld-3.0: Add build configuration for the qdf hang event

In qdf new hang event notifier chain has been added, enable
the build configration for the feature.

Change-Id: I98e2701499133d208af863b401fc47fafec35226
CRs-Fixed: 2648449

Kbuild

@@ -677,6 +677,10 @@ ifeq ($(CONFIG_QDF_TEST), y)
 	QDF_OBJS += $(QDF_TEST_OBJ_DIR)/qdf_types_test.o
 endif
 
+ifeq ($(CONFIG_WLAN_HANG_EVENT), y)
+	QDF_OBJS += $(QDF_OBJ_DIR)/qdf_hang_event_notifier.o
+endif
+
 cppflags-$(CONFIG_TALLOC_DEBUG) += -DWLAN_TALLOC_DEBUG
 cppflags-$(CONFIG_QDF_TEST) += -DWLAN_DELAYED_WORK_TEST
 cppflags-$(CONFIG_QDF_TEST) += -DWLAN_HASHTABLE_TEST